feat: Enhance audio settings with ReplayGain, crossfade, and equalizer presets; add AudioSettingsDialog component

app/components/AudioPlayer.tsx

@@ -11,9 +11,25 @@ import { useToast } from '@/hooks/use-toast';
 import { useLastFmScrobbler } from '@/hooks/use-lastfm-scrobbler';
 import { useStandaloneLastFm } from '@/hooks/use-standalone-lastfm';
 import { useIsMobile } from '@/hooks/use-mobile';
+import { DraggableMiniPlayer } from './DraggableMiniPlayer';
 
 export const AudioPlayer: React.FC = () => {
-  const { currentTrack, playPreviousTrack, addToQueue, playNextTrack, clearQueue, queue, toggleShuffle, shuffle, toggleCurrentTrackStar } = useAudioPlayer();
+  const { 
+    currentTrack, 
+    playPreviousTrack, 
+    addToQueue, 
+    playNextTrack, 
+    clearQueue, 
+    queue, 
+    toggleShuffle, 
+    shuffle, 
+    toggleCurrentTrackStar,
+    audioSettings,
+    updateAudioSettings,
+    equalizerPreset,
+    setEqualizerPreset,
+    audioEffects
+  } = useAudioPlayer();
   const router = useRouter();
   const isMobile = useIsMobile();
   
@@ -116,16 +132,18 @@ export const AudioPlayer: React.FC = () => {
   useEffect(() => {
     setIsClient(true);
     
-    // Load saved volume
-    const savedVolume = localStorage.getItem('navidrome-volume');
-    if (savedVolume) {
-      try {
-        const volumeValue = parseFloat(savedVolume);
-        if (volumeValue >= 0 && volumeValue <= 1) {
-          setVolume(volumeValue);
+    if (currentTrack) {
+      // Load saved volume
+      const savedVolume = localStorage.getItem('navidrome-volume');
+      if (savedVolume) {
+        try {
+          const volumeValue = parseFloat(savedVolume);
+          if (volumeValue >= 0 && volumeValue <= 1) {
+            setVolume(volumeValue);
+          }
+        } catch (error) {
+          console.error('Failed to parse saved volume:', error);
         }
-      } catch (error) {
-        console.error('Failed to parse saved volume:', error);
       }
     }
     
@@ -221,17 +239,22 @@ export const AudioPlayer: React.FC = () => {
       }
     }
     keysToRemove.forEach(key => localStorage.removeItem(key));
-  }, [isMobile, audioInitialized, volume]);
+  }, [isMobile, audioInitialized, volume, currentTrack]);
 
   // Apply volume to audio element when volume changes
   useEffect(() => {
     const audioCurrent = audioRef.current;
     if (audioCurrent) {
-      audioCurrent.volume = volume;
+      // Apply volume through audio effects chain if available
+      if (audioEffects) {
+        audioEffects.setVolume(volume);
+      } else {
+        audioCurrent.volume = volume;
+      }
     }
     // Save volume to localStorage
     localStorage.setItem('navidrome-volume', volume.toString());
-  }, [volume]);
+  }, [volume, audioEffects]);
 
   // Save position when component unmounts or track changes
   useEffect(() => {
@@ -245,6 +268,7 @@ export const AudioPlayer: React.FC = () => {
 
   useEffect(() => {
     const audioCurrent = audioRef.current;
+    const preloadAudioCurrent = preloadAudioRef.current;
     
     if (currentTrack && audioCurrent && audioCurrent.src !== currentTrack.url) {
       // Always clear current track time when changing tracks
@@ -257,6 +281,20 @@ export const AudioPlayer: React.FC = () => {
         console.error('❌ Invalid audio URL:', currentTrack.url);
         return;
       }
+
+      // If we have audio effects and ReplayGain is enabled, apply it
+      if (audioEffects && audioSettings.replayGainEnabled && currentTrack.replayGain) {
+        audioEffects.setReplayGain(currentTrack.replayGain);
+      }
+
+      // For gapless playback, start preloading the next track
+      if (audioSettings.gaplessPlayback && queue.length > 0) {
+        const nextTrack = queue[0];
+        if (preloadAudioCurrent && nextTrack) {
+          preloadAudioCurrent.src = nextTrack.url;
+          preloadAudioCurrent.load();
+        }
+      }
       
       // Debug: Log current audio element state
       console.log('🔍 Audio element state before loading:', {
@@ -370,7 +408,7 @@ export const AudioPlayer: React.FC = () => {
         setIsPlaying(false);
       }
     }
-  }, [currentTrack, onTrackStart, onTrackPlay, isMobile, audioInitialized]);
+  }, [currentTrack, onTrackStart, onTrackPlay, isMobile, audioInitialized, audioEffects, audioSettings.gaplessPlayback, audioSettings.replayGainEnabled, queue]);
 
   useEffect(() => {
     const audioCurrent = audioRef.current;
@@ -399,6 +437,12 @@ export const AudioPlayer: React.FC = () => {
         
         // Notify scrobbler about track end
         onTrackEnd(currentTrack, audioCurrent.currentTime, audioCurrent.duration);
+
+        // If crossfade is enabled and we have more tracks in queue
+        if (audioSettings.crossfadeDuration > 0 && queue.length > 0 && audioEffects) {
+          // Start fading out current track
+          audioEffects.setCrossfadeTime(audioSettings.crossfadeDuration);
+        }
       }
       playNextTrack();
     };
@@ -442,49 +486,50 @@ export const AudioPlayer: React.FC = () => {
         audioCurrent.removeEventListener('pause', handlePause);
       }
     };
-  }, [playNextTrack, currentTrack, onTrackProgress, onTrackEnd, onTrackPlay, onTrackPause]);
+  }, [playNextTrack, currentTrack, onTrackProgress, onTrackEnd, onTrackPlay, onTrackPause, audioEffects, audioSettings.crossfadeDuration, queue.length]);
 
   // Update document title and optionally show a notification when a new song starts
   useEffect(() => {
-    if (!isClient) return;
-    if (currentTrack) {
-      // Update favicon/title like Spotify
-      const baseTitle = `${currentTrack.name} • ${currentTrack.artist} – mice`;
-      document.title = isPlaying ? baseTitle : `(Paused) ${baseTitle}`;
-
-      // Notifications
-      const notifyEnabled = localStorage.getItem('playback-notifications-enabled') === 'true';
-      const canNotify = 'Notification' in window && Notification.permission !== 'denied';
-      if (notifyEnabled && canNotify && lastNotifiedTrackId !== currentTrack.id) {
-        try {
-          if (Notification.permission === 'default') {
-            Notification.requestPermission().then((perm) => {
-              if (perm === 'granted') {
-                new Notification('Now Playing', {
-                  body: `${currentTrack.name} — ${currentTrack.artist}`,
-                  icon: currentTrack.coverArt || '/icon-192.png',
-                  badge: '/icon-192.png',
-                });
-                setLastNotifiedTrackId(currentTrack.id);
-              }
-            });
-          } else if (Notification.permission === 'granted') {
-            new Notification('Now Playing', {
-              body: `${currentTrack.name} — ${currentTrack.artist}`,
-              icon: currentTrack.coverArt || '/icon-192.png',
-              badge: '/icon-192.png',
-            });
-            setLastNotifiedTrackId(currentTrack.id);
-          }
-        } catch (e) {
-          console.warn('Notification failed:', e);
-        }
+    if (!isClient || !currentTrack) {
+      if (!currentTrack) {
+        document.title = 'mice';
       }
-    } else {
-      // Reset title when no track
-      document.title = 'mice';
+      return;
     }
-  }, [currentTrack?.id, currentTrack?.name, currentTrack?.artist, currentTrack?.coverArt, isPlaying, isClient, lastNotifiedTrackId]);
+
+    // Update favicon/title like Spotify
+    const baseTitle = `${currentTrack.name} • ${currentTrack.artist} – mice`;
+    document.title = isPlaying ? baseTitle : `(Paused) ${baseTitle}`;
+
+    // Notifications
+    const notifyEnabled = localStorage.getItem('playback-notifications-enabled') === 'true';
+    const canNotify = 'Notification' in window && Notification.permission !== 'denied';
+    if (notifyEnabled && canNotify && lastNotifiedTrackId !== currentTrack.id) {
+      try {
+        if (Notification.permission === 'default') {
+          Notification.requestPermission().then((perm) => {
+            if (perm === 'granted') {
+              new Notification('Now Playing', {
+                body: `${currentTrack.name} — ${currentTrack.artist}`,
+                icon: currentTrack.coverArt || '/icon-192.png',
+                badge: '/icon-192.png',
+              });
+              setLastNotifiedTrackId(currentTrack.id);
+            }
+          });
+        } else if (Notification.permission === 'granted') {
+          new Notification('Now Playing', {
+            body: `${currentTrack.name} — ${currentTrack.artist}`,
+            icon: currentTrack.coverArt || '/icon-192.png',
+            badge: '/icon-192.png',
+          });
+          setLastNotifiedTrackId(currentTrack.id);
+        }
+      } catch (e) {
+        console.warn('Notification failed:', e);
+      }
+    }
+  }, [currentTrack, isPlaying, isClient, lastNotifiedTrackId]);
 
   // Media Session API integration - Enhanced for mobile
   useEffect(() => {
@@ -863,54 +908,7 @@ export const AudioPlayer: React.FC = () => {
   if (isMinimized) {
     return (
       <>
-        <div className="fixed bottom-4 left-4 z-50">
-          <div 
-            className="bg-background/95 backdrop-blur-xs border rounded-lg shadow-lg cursor-pointer hover:scale-[1.02] transition-transform w-80"
-            onClick={() => setIsMinimized(false)}
-          >
-            <div className="flex items-center p-3">
-              <Image 
-                src={currentTrack.coverArt || '/default-user.jpg'} 
-                alt={currentTrack.name} 
-                width={40} 
-                height={40} 
-                className="w-10 h-10 rounded-md shrink-0" 
-              />
-              <div className="flex-1 min-w-0 mx-3">
-                <div className="overflow-hidden">
-                  <p className="font-semibold text-sm whitespace-nowrap animate-infinite-scroll">
-                    {currentTrack.name}
-                  </p>
-                </div>
-                <p className="text-xs text-muted-foreground truncate">{currentTrack.artist}</p>
-              </div>
-              {/* Heart icon for favoriting */}
-              <button 
-                className="p-1.5 hover:bg-gray-700/50 rounded-full transition-colors mr-2" 
-                onClick={(e) => {
-                  e.stopPropagation();
-                  toggleCurrentTrackStar();
-                }}
-                title={currentTrack.starred ? 'Remove from favorites' : 'Add to favorites'}
-              >
-                <Heart 
-                  className={`w-4 h-4 ${currentTrack.starred ? 'text-primary fill-primary' : 'text-gray-400'}`} 
-                />
-              </button>
-              <div className="flex items-center justify-center space-x-2">
-            <button className="p-1.5 hover:bg-gray-700/50 rounded-full transition-colors" onClick={playPreviousTrack}>
-              <FaBackward className="w-3 h-3" />
-            </button>
-            <button className="p-2 hover:bg-gray-700/50 rounded-full transition-colors" onClick={togglePlayPause}>
-              {isPlaying ? <FaPause className="w-4 h-4" /> : <FaPlay className="w-4 h-4" />}
-            </button>
-            <button className="p-1.5 hover:bg-gray-700/50 rounded-full transition-colors" onClick={playNextTrack}>
-              <FaForward className="w-3 h-3" />
-            </button>
-          </div>
-            </div>
-          </div>
-        </div>
+        <DraggableMiniPlayer onExpand={() => setIsMinimized(false)} />
         
         {/* Single audio element - shared across all UI states */}
         <audio 

app/components/AudioPlayerContext.tsx

@@ -1,9 +1,10 @@
 'use client';
 
-import React, { createContext, useContext, useState, useEffect, useMemo, useCallback } from 'react';
-import { Song, Album, Artist } from '@/lib/navidrome';
+import React, { createContext, useContext, useState, useEffect, useMemo, useCallback, useRef } from 'react';
+import { Song } from '@/lib/navidrome';
 import { getNavidromeAPI } from '@/lib/navidrome';
 import { useToast } from "@/hooks/use-toast";
+import { AudioEffects } from '@/lib/audio-effects';
 
 export interface Track {
   id: string;
@@ -15,8 +16,16 @@ export interface Track {
   coverArt?: string;
   albumId: string;
   artistId: string;
-  autoPlay?: boolean; // Flag to control auto-play
-  starred?: boolean; // Flag for starred/favorited tracks
+  autoPlay?: boolean;
+  starred?: boolean;
+  replayGain?: number; // Added ReplayGain field
+}
+
+interface AudioSettings {
+  crossfadeDuration: number;
+  equalizer: string;
+  replayGainEnabled: boolean;
+  gaplessPlayback: boolean;
 }
 
 interface AudioPlayerContextProps {
@@ -42,16 +51,37 @@ interface AudioPlayerContextProps {
   clearHistory: () => void;
   toggleCurrentTrackStar: () => Promise<void>;
   updateTrackStarred: (trackId: string, starred: boolean) => void;
+  // Audio settings
+  audioSettings: AudioSettings;
+  updateAudioSettings: (settings: Partial<AudioSettings>) => void;
+  equalizerPreset: string;
+  setEqualizerPreset: (preset: string) => void;
+  audioEffects: AudioEffects | null;
+  // Playback state
+  isPlaying: boolean;
+  togglePlayPause: () => Promise<void>;
 }
 
 const AudioPlayerContext = createContext<AudioPlayerContextProps | undefined>(undefined);
 
+export // Default audio settings
+const DEFAULT_AUDIO_SETTINGS: AudioSettings = {
+  crossfadeDuration: 3,
+  equalizer: 'normal',
+  replayGainEnabled: true,
+  gaplessPlayback: true
+};
+
 export const AudioPlayerProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
   const [currentTrack, setCurrentTrack] = useState<Track | null>(null);
   const [queue, setQueue] = useState<Track[]>([]);
   const [playedTracks, setPlayedTracks] = useState<Track[]>([]);
   const [isLoading, setIsLoading] = useState(false);
   const [shuffle, setShuffle] = useState(false);
+  const [audioSettings, setAudioSettings] = useState<AudioSettings>(DEFAULT_AUDIO_SETTINGS);
+  const [equalizerPreset, setEqualizerPreset] = useState('normal');
+  const [audioEffects, setAudioEffects] = useState<AudioEffects | null>(null);
+  const audioRef = useRef<HTMLAudioElement | null>(null);
   const { toast } = useToast();
   const api = useMemo(() => {
     const navidromeApi = getNavidromeAPI();
@@ -102,6 +132,73 @@ export const AudioPlayerProvider: React.FC<{ children: React.ReactNode }> = ({ c
     }
   }, [currentTrack]);
 
+  // Initialize audio effects when audio element is available
+  useEffect(() => {
+    const audioElement = audioRef.current;
+    if (audioElement && !audioEffects) {
+      const effects = new AudioEffects(audioElement);
+      setAudioEffects(effects);
+
+      // Load saved audio settings
+      const savedSettings = localStorage.getItem('navidrome-audio-settings');
+      if (savedSettings) {
+        try {
+          const settings = JSON.parse(savedSettings);
+          setAudioSettings(settings);
+          effects.setPreset(settings.equalizer);
+          setEqualizerPreset(settings.equalizer);
+        } catch (error) {
+          console.error('Failed to load audio settings:', error);
+        }
+      }
+
+      return () => {
+        effects.disconnect();
+      };
+    }
+  }, [audioEffects]);
+
+  // Save all audio-related settings
+  const saveSettings = useCallback(() => {
+    try {
+      // Save audio settings
+      localStorage.setItem('navidrome-audio-settings', JSON.stringify(audioSettings));
+      // Save equalizer preset
+      localStorage.setItem('navidrome-equalizer-preset', equalizerPreset);
+      // Save other playback settings
+      const playbackSettings = {
+        replayGainEnabled: audioSettings.replayGainEnabled,
+        gaplessPlayback: audioSettings.gaplessPlayback,
+        crossfadeDuration: audioSettings.crossfadeDuration,
+        volume: audioRef.current?.volume || 1,
+        lastPosition: audioRef.current?.currentTime || 0
+      };
+      localStorage.setItem('navidrome-playback-settings', JSON.stringify(playbackSettings));
+    } catch (error) {
+      console.error('Failed to save settings:', error);
+    }
+  }, [audioSettings, equalizerPreset]);
+
+  // Save settings whenever they change
+  useEffect(() => {
+    saveSettings();
+  }, [audioSettings, equalizerPreset, saveSettings]);
+
+  // Update equalizer when preset changes
+  useEffect(() => {
+    if (audioEffects) {
+      audioEffects.setPreset(equalizerPreset);
+    }
+  }, [equalizerPreset, audioEffects]);
+
+  const updateAudioSettings = useCallback((settings: Partial<AudioSettings>) => {
+    setAudioSettings(prev => {
+      const newSettings = { ...prev, ...settings };
+      localStorage.setItem('navidrome-audio-settings', JSON.stringify(newSettings));
+      return newSettings;
+    });
+  }, []);
+
   const songToTrack = useMemo(() => (song: Song): Track => {
     if (!api) {
       throw new Error('Navidrome API not configured');
@@ -120,7 +217,8 @@ export const AudioPlayerProvider: React.FC<{ children: React.ReactNode }> = ({ c
       coverArt: song.coverArt ? api.getCoverArtUrl(song.coverArt, 512) : undefined,
       albumId: song.albumId,
       artistId: song.artistId,
-      starred: !!song.starred
+      starred: !!song.starred,
+      replayGain: song.replayGain || 0 // Add ReplayGain support
     };
   }, [api]);
 
@@ -573,6 +671,32 @@ export const AudioPlayerProvider: React.FC<{ children: React.ReactNode }> = ({ c
       }
     }
   }, []);
+  // Track playback state
+  const [isPlaying, setIsPlaying] = useState(false);
+
+  // Shared playback control function
+  const togglePlayPause = useCallback(async () => {
+    const audioElement = audioRef.current;
+    if (!audioElement || !currentTrack) return;
+
+    try {
+      if (isPlaying) {
+        audioElement.pause();
+        setIsPlaying(false);
+      } else {
+        await audioElement.play();
+        setIsPlaying(true);
+      }
+    } catch (error) {
+      console.error('Failed to toggle playback:', error);
+      toast({
+        variant: "destructive",
+        title: "Playback Error",
+        description: "Failed to control playback. Please try again.",
+      });
+    }
+  }, [currentTrack, isPlaying, toast]);
+
   const contextValue = useMemo(() => ({
     currentTrack, 
     playTrack, 
@@ -594,6 +718,15 @@ export const AudioPlayerProvider: React.FC<{ children: React.ReactNode }> = ({ c
     playArtist,
     playedTracks,
     clearHistory,
+    // Audio settings
+    audioSettings,
+    updateAudioSettings,
+    equalizerPreset,
+    setEqualizerPreset,
+    audioEffects,
+    // Playback state
+    isPlaying,
+    togglePlayPause,
     toggleCurrentTrackStar: async () => {
       if (!currentTrack || !api) {
         toast({
@@ -684,7 +817,14 @@ export const AudioPlayerProvider: React.FC<{ children: React.ReactNode }> = ({ c
     playedTracks,
     clearHistory,
     api,
-    toast
+    toast,
+    audioEffects,
+    audioSettings,
+    equalizerPreset,
+    updateAudioSettings,
+    setEqualizerPreset,
+    isPlaying,
+    togglePlayPause
   ]);
 
   return (

app/components/AudioSettingsDialog.tsx

@@ -0,0 +1,102 @@
+'use client';
+
+import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from "@/components/ui/dialog";
+import { Slider } from "@/components/ui/slider";
+import { Switch } from "@/components/ui/switch";
+import { Button } from "@/components/ui/button";
+import { Label } from "@/components/ui/label";
+import { useAudioPlayer } from "./AudioPlayerContext";
+import { presets } from "@/lib/audio-effects";
+
+interface AudioSettingsDialogProps {
+  isOpen: boolean;
+  onClose: () => void;
+}
+
+export function AudioSettingsDialog({ isOpen, onClose }: AudioSettingsDialogProps) {
+  const { 
+    audioSettings,
+    updateAudioSettings,
+    equalizerPreset,
+    setEqualizerPreset,
+  } = useAudioPlayer();
+
+  const handleCrossfadeChange = (value: number[]) => {
+    updateAudioSettings({ crossfadeDuration: value[0] });
+  };
+
+  const handleReplayGainToggle = (enabled: boolean) => {
+    updateAudioSettings({ replayGainEnabled: enabled });
+  };
+
+  const handleGaplessToggle = (enabled: boolean) => {
+    updateAudioSettings({ gaplessPlayback: enabled });
+  };
+
+  const handleEqualizerPresetChange = (preset: string) => {
+    setEqualizerPreset(preset);
+    updateAudioSettings({ equalizer: preset });
+  };
+
+  return (
+    <Dialog open={isOpen} onOpenChange={onClose}>
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>Audio Settings</DialogTitle>
+          <DialogDescription>
+            Configure playback settings and audio effects
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="space-y-6">
+          {/* Crossfade */}
+          <div className="space-y-2">
+            <Label>Crossfade Duration ({audioSettings.crossfadeDuration}s)</Label>
+            <Slider
+              value={[audioSettings.crossfadeDuration]}
+              onValueChange={handleCrossfadeChange}
+              min={0}
+              max={5}
+              step={0.5}
+            />
+          </div>
+
+          {/* ReplayGain */}
+          <div className="flex items-center justify-between">
+            <Label>ReplayGain</Label>
+            <Switch
+              checked={audioSettings.replayGainEnabled}
+              onCheckedChange={handleReplayGainToggle}
+            />
+          </div>
+
+          {/* Gapless Playback */}
+          <div className="flex items-center justify-between">
+            <Label>Gapless Playback</Label>
+            <Switch
+              checked={audioSettings.gaplessPlayback}
+              onCheckedChange={handleGaplessToggle}
+            />
+          </div>
+
+          {/* Equalizer Presets */}
+          <div className="space-y-2">
+            <Label>Equalizer Preset</Label>
+            <div className="grid grid-cols-2 gap-2">
+              {Object.keys(presets).map((preset) => (
+                <Button
+                  key={preset}
+                  variant={preset === equalizerPreset ? "default" : "outline"}
+                  onClick={() => handleEqualizerPresetChange(preset)}
+                  className="w-full"
+                >
+                  {presets[preset].name}
+                </Button>
+              ))}
+            </div>
+          </div>
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+}

app/components/DraggableMiniPlayer.tsx

@@ -0,0 +1,274 @@
+'use client';
+
+import React, { useRef, useState, useEffect } from 'react';
+import Image from 'next/image';
+import { motion, PanInfo, AnimatePresence } from 'framer-motion';
+import { useAudioPlayer, Track } from './AudioPlayerContext';
+import { FaPlay, FaPause, FaExpand, FaForward, FaBackward } from 'react-icons/fa6';
+import { Heart } from 'lucide-react';
+import { constrain } from '@/lib/utils';
+
+interface DraggableMiniPlayerProps {
+  onExpand: () => void;
+}
+
+export const DraggableMiniPlayer: React.FC<DraggableMiniPlayerProps> = ({ onExpand }) => {
+  const { 
+    currentTrack, 
+    playPreviousTrack, 
+    playNextTrack,
+    toggleCurrentTrackStar,
+    isPlaying,
+    togglePlayPause 
+  } = useAudioPlayer();
+
+  const [position, setPosition] = useState({ x: 0, y: 0 });
+  const [isDragging, setIsDragging] = useState(false);
+  const containerRef = useRef<HTMLDivElement>(null);
+  const dragStartRef = useRef({ x: 0, y: 0 });
+
+  // Save position to localStorage when it changes
+  useEffect(() => {
+    if (!isDragging) {
+      localStorage.setItem('mini-player-position', JSON.stringify(position));
+    }
+  }, [position, isDragging]);
+
+  // Keyboard controls for the mini player
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      // Only handle keyboard shortcuts if the mini player is focused
+      if (document.activeElement?.tagName === 'INPUT') return;
+
+      const step = e.shiftKey ? 100 : 10; // Larger steps with shift key
+      
+      switch (e.key) {
+        case 'ArrowLeft':
+          setPosition(prev => ({
+            ...prev,
+            x: constrain(
+              prev.x - step,
+              -(window.innerWidth - (containerRef.current?.offsetWidth || 0)) / 2 + 16,
+              (window.innerWidth - (containerRef.current?.offsetWidth || 0)) / 2 - 16
+            )
+          }));
+          break;
+        case 'ArrowRight':
+          setPosition(prev => ({
+            ...prev,
+            x: constrain(
+              prev.x + step,
+              -(window.innerWidth - (containerRef.current?.offsetWidth || 0)) / 2 + 16,
+              (window.innerWidth - (containerRef.current?.offsetWidth || 0)) / 2 - 16
+            )
+          }));
+          break;
+        case 'ArrowUp':
+          setPosition(prev => ({
+            ...prev,
+            y: constrain(
+              prev.y - step,
+              -(window.innerHeight - (containerRef.current?.offsetHeight || 0)) / 2 + 16,
+              (window.innerHeight - (containerRef.current?.offsetHeight || 0)) / 2 - 16
+            )
+          }));
+          break;
+        case 'ArrowDown':
+          setPosition(prev => ({
+            ...prev,
+            y: constrain(
+              prev.y + step,
+              -(window.innerHeight - (containerRef.current?.offsetHeight || 0)) / 2 + 16,
+              (window.innerHeight - (containerRef.current?.offsetHeight || 0)) / 2 - 16
+            )
+          }));
+          break;
+        case 'Escape':
+          onExpand();
+          break;
+      }
+    };
+
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, [onExpand]);
+
+  // Load saved position on mount
+  useEffect(() => {
+    const savedPosition = localStorage.getItem('mini-player-position');
+    if (savedPosition) {
+      try {
+        const pos = JSON.parse(savedPosition);
+        setPosition(pos);
+      } catch (error) {
+        console.error('Failed to parse saved mini player position:', error);
+      }
+    }
+  }, []);
+
+  // Ensure player stays within viewport bounds
+  useEffect(() => {
+    const constrainToViewport = () => {
+      if (!containerRef.current || isDragging) return;
+
+      const rect = containerRef.current.getBoundingClientRect();
+      const viewportWidth = window.innerWidth;
+      const viewportHeight = window.innerHeight;
+
+      // Add some padding from edges
+      const padding = 16;
+      
+      const newX = constrain(
+        position.x,
+        -(viewportWidth - rect.width) / 2 + padding,
+        (viewportWidth - rect.width) / 2 - padding
+      );
+      
+      const newY = constrain(
+        position.y,
+        -(viewportHeight - rect.height) / 2 + padding,
+        (viewportHeight - rect.height) / 2 - padding
+      );
+
+      if (newX !== position.x || newY !== position.y) {
+        setPosition({ x: newX, y: newY });
+      }
+    };
+
+    constrainToViewport();
+    window.addEventListener('resize', constrainToViewport);
+    return () => window.removeEventListener('resize', constrainToViewport);
+  }, [position, isDragging]);
+
+  const handleDragStart = () => {
+    setIsDragging(true);
+    dragStartRef.current = position;
+  };
+
+  const handleDrag = (_: MouseEvent | TouchEvent | PointerEvent, info: PanInfo) => {
+    setPosition({
+      x: dragStartRef.current.x + info.offset.x,
+      y: dragStartRef.current.y + info.offset.y
+    });
+  };
+
+  const handleDragEnd = () => {
+    setIsDragging(false);
+  };
+
+  if (!currentTrack) return null;
+
+  return (
+    <AnimatePresence>
+      <motion.div
+        ref={containerRef}
+        drag
+        dragMomentum={false}
+        dragElastic={0}
+        onDragStart={handleDragStart}
+        onDrag={handleDrag}
+        onDragEnd={handleDragEnd}
+        animate={{
+          x: position.x + window.innerWidth / 2,
+          y: position.y + window.innerHeight / 2,
+          scale: isDragging ? 1.02 : 1,
+          opacity: isDragging ? 0.8 : 1
+        }}
+        transition={{ type: 'spring', damping: 20 }}
+        style={{ 
+          position: 'fixed',
+          zIndex: 100,
+          transform: `translate(-50%, -50%)`
+        }}
+        className="cursor-grab active:cursor-grabbing"
+      >
+        <div className="bg-background/95 backdrop-blur-sm border rounded-lg shadow-xl hover:shadow-2xl transition-shadow p-3 w-[280px]">
+          <div className="flex items-center gap-3">
+            {/* Album Art */}
+            <div className="relative w-12 h-12 shrink-0">
+              <Image
+                src={currentTrack.coverArt || '/default-user.jpg'}
+                alt={currentTrack.name}
+                fill
+                className="rounded object-cover"
+              />
+            </div>
+
+            {/* Track Info */}
+            <div className="flex-1 min-w-0">
+              <p className="font-semibold text-sm truncate">{currentTrack.name}</p>
+              <p className="text-xs text-muted-foreground truncate">{currentTrack.artist}</p>
+            </div>
+          </div>
+
+          {/* Controls */}
+          {/* Keyboard shortcut hint */}
+        <div className="text-xs text-muted-foreground text-center mt-2 px-2">
+          Arrow keys to move • Hold Shift for larger steps • Esc to expand
+        </div>
+
+        <div className="flex items-center justify-between mt-2 px-2">
+            <button
+              onClick={(e) => {
+                e.stopPropagation();
+                toggleCurrentTrackStar();
+              }}
+              className="p-2 hover:bg-muted/50 rounded-full transition-colors"
+              title={currentTrack.starred ? 'Remove from favorites' : 'Add to favorites'}
+            >
+              <Heart
+                className={`w-4 h-4 ${currentTrack.starred ? 'text-primary fill-primary' : ''}`}
+              />
+            </button>
+
+            <div className="flex items-center gap-2">
+              <button
+                onClick={(e) => {
+                  e.stopPropagation();
+                  playPreviousTrack();
+                }}
+                className="p-2 hover:bg-muted/50 rounded-full transition-colors"
+              >
+                <FaBackward className="w-3 h-3" />
+              </button>
+
+              <button
+                onClick={(e) => {
+                  e.stopPropagation();
+                  togglePlayPause();
+                }}
+                className="p-3 hover:bg-muted/50 rounded-full transition-colors"
+              >
+                {isPlaying ? (
+                  <FaPause className="w-4 h-4" />
+                ) : (
+                  <FaPlay className="w-4 h-4" />
+                )}
+              </button>
+
+              <button
+                onClick={(e) => {
+                  e.stopPropagation();
+                  playNextTrack();
+                }}
+                className="p-2 hover:bg-muted/50 rounded-full transition-colors"
+              >
+                <FaForward className="w-3 h-3" />
+              </button>
+            </div>
+
+            <button
+              onClick={(e) => {
+                e.stopPropagation();
+                onExpand();
+              }}
+              className="p-2 hover:bg-muted/50 rounded-full transition-colors"
+            >
+              <FaExpand className="w-4 h-4" />
+            </button>
+          </div>
+        </div>
+      </motion.div>
+    </AnimatePresence>
+  );
+};

app/components/FullScreenPlayer.tsx

@@ -9,6 +9,7 @@ import { Progress } from '@/components/ui/progress';
 import { lrcLibClient } from '@/lib/lrclib';
 import Link from 'next/link';
 import { useIsMobile } from '@/hooks/use-mobile';
+import { AudioSettingsDialog } from './AudioSettingsDialog';
 import { 
   FaPlay, 
   FaPause, 
@@ -20,7 +21,8 @@ import {
   FaRepeat,
   FaXmark,
   FaQuoteLeft,
-  FaListUl
+  FaListUl,
+  FaSliders
 } from "react-icons/fa6";
 import { Heart } from 'lucide-react';
 import { ScrollArea } from '@/components/ui/scroll-area';
@@ -46,8 +48,11 @@ export const FullScreenPlayer: React.FC<FullScreenPlayerProps> = ({ isOpen, onCl
     shuffle, 
     toggleShuffle, 
     toggleCurrentTrackStar,
-    queue 
+    queue,
+    audioSettings,
+    updateAudioSettings
   } = useAudioPlayer();
+  const [showAudioSettings, setShowAudioSettings] = useState(false);
   
   const isMobile = useIsMobile();
   const router = useRouter();
@@ -441,8 +446,9 @@ export const FullScreenPlayer: React.FC<FullScreenPlayerProps> = ({ isOpen, onCl
   if (!currentTrack) return null;
 
   return (
-    <AnimatePresence>
-      {isOpen && (
+    <>
+      <AnimatePresence>
+        {isOpen && (
       <motion.div
         className="fixed inset-0 z-[70] bg-black overflow-hidden"
         initial={{ opacity: 0 }}
@@ -911,6 +917,14 @@ export const FullScreenPlayer: React.FC<FullScreenPlayerProps> = ({ isOpen, onCl
                       <FaQuoteLeft className="w-5 h-5" />
                     </button>
                   )}
+
+                  <button
+                    onClick={() => setShowAudioSettings(true)}
+                    className="p-2 hover:bg-gray-700/50 rounded-full transition-colors"
+                    title="Audio Settings"
+                  >
+                    <FaSliders className="w-5 h-5" />
+                  </button>
                   
                   {showVolumeSlider && (
                     <div 
@@ -987,5 +1001,10 @@ export const FullScreenPlayer: React.FC<FullScreenPlayerProps> = ({ isOpen, onCl
   </motion.div>
   )}
     </AnimatePresence>
+    <AudioSettingsDialog 
+      isOpen={showAudioSettings}
+      onClose={() => setShowAudioSettings(false)}
+    />
+    </>
   );
 };

app/settings/page.tsx

@@ -4,6 +4,7 @@ import React, { useState, useEffect } from 'react';
 import { Label } from '@/components/ui/label';
 import { Select, SelectTrigger, SelectContent, SelectItem, SelectValue } from '@/components/ui/select';
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import { useAudioPlayer } from '@/app/components/AudioPlayerContext';
 import { Input } from '@/components/ui/input';
 import { Button } from '@/components/ui/button';
 import { useTheme } from '@/app/components/ThemeProvider';
@@ -25,6 +26,7 @@ const SettingsPage = () => {
     const { toast } = useToast();
     const { isEnabled: isStandaloneLastFmEnabled, getCredentials, getAuthUrl, getSessionKey } = useStandaloneLastFm();
     const { shortcutType, updateShortcutType } = useSidebarShortcuts();
+    const audioPlayer = useAudioPlayer();
     
     const [formData, setFormData] = useState({
         serverUrl: '',
@@ -835,6 +837,87 @@ const SettingsPage = () => {
                 </Card>
 
                 {/* Theme Preview */}
+                <Card className="mb-6 break-inside-avoid py-5">
+                    <CardHeader>
+                        <CardTitle className="flex items-center gap-2">
+                            <FaCog className="w-5 h-5" />
+                            Audio Settings
+                        </CardTitle>
+                        <CardDescription>
+                            Configure playback and audio effects
+                        </CardDescription>
+                    </CardHeader>
+                    <CardContent className="space-y-6">
+                        {/* Crossfade */}
+                        <div className="space-y-2">
+                            <Label htmlFor="crossfade-duration">Crossfade Duration</Label>
+                            <Select 
+                                value={String(audioPlayer.audioSettings.crossfadeDuration)}
+                                onValueChange={(value) => audioPlayer.updateAudioSettings({ crossfadeDuration: Number(value) })}
+                            >
+                                <SelectTrigger id="crossfade-duration">
+                                    <SelectValue />
+                                </SelectTrigger>
+                                <SelectContent>
+                                    <SelectItem value="0">Off</SelectItem>
+                                    <SelectItem value="2">2 seconds</SelectItem>
+                                    <SelectItem value="3">3 seconds</SelectItem>
+                                    <SelectItem value="4">4 seconds</SelectItem>
+                                    <SelectItem value="5">5 seconds</SelectItem>
+                                </SelectContent>
+                            </Select>
+                        </div>
+
+                        {/* Equalizer Preset */}
+                        <div className="space-y-2">
+                            <Label htmlFor="equalizer-preset">Equalizer Preset</Label>
+                            <Select 
+                                value={audioPlayer.equalizerPreset} 
+                                onValueChange={audioPlayer.setEqualizerPreset}
+                            >
+                                <SelectTrigger id="equalizer-preset">
+                                    <SelectValue />
+                                </SelectTrigger>
+                                <SelectContent>
+                                    <SelectItem value="normal">Normal</SelectItem>
+                                    <SelectItem value="bassBoost">Bass Boost</SelectItem>
+                                    <SelectItem value="trebleBoost">Treble Boost</SelectItem>
+                                    <SelectItem value="vocalBoost">Vocal Boost</SelectItem>
+                                </SelectContent>
+                            </Select>
+                        </div>
+
+                        {/* ReplayGain */}
+                        <div className="flex items-center justify-between">
+                            <div>
+                                <Label>ReplayGain</Label>
+                                <p className="text-sm text-muted-foreground">Normalize volume across tracks</p>
+                            </div>
+                            <Switch 
+                                checked={audioPlayer.audioSettings.replayGainEnabled}
+                                onCheckedChange={(checked) => audioPlayer.updateAudioSettings({ replayGainEnabled: checked })}
+                            />
+                        </div>
+
+                        {/* Gapless Playback */}
+                        <div className="flex items-center justify-between">
+                            <div>
+                                <Label>Gapless Playback</Label>
+                                <p className="text-sm text-muted-foreground">Seamless transitions between tracks</p>
+                            </div>
+                            <Switch 
+                                checked={audioPlayer.audioSettings.gaplessPlayback}
+                                onCheckedChange={(checked) => audioPlayer.updateAudioSettings({ gaplessPlayback: checked })}
+                            />
+                        </div>                        <div className="text-sm text-muted-foreground space-y-2">
+                            <p><strong>Crossfade:</strong> Smooth fade between tracks (2-5 seconds)</p>
+                            <p><strong>Equalizer:</strong> Preset frequency adjustments for different music styles</p>
+                            <p><strong>ReplayGain:</strong> Consistent volume across all tracks in your library</p>
+                            <p><strong>Gapless:</strong> Perfect for live albums and continuous DJ mixes</p>
+                        </div>
+                    </CardContent>
+                </Card>
+
                 <Card className="mb-6 break-inside-avoid py-5">
                     <CardHeader>
                         <CardTitle>Preview</CardTitle>