diff --git a/Makefile b/Makefile
index 18475d6..77fff73 100644
--- a/Makefile
+++ b/Makefile
@@ -51,7 +51,7 @@ EXTRA_OUTPUT_FILES :=
 LIBRARY_DIRS := $(DEVKITPRO)/libctru $(DEVKITPRO)/portlibs/armv6k
 LIBRARIES := mpg123 opusfile opus ogg ctru m
 
-BUILD_FLAGS :=
+BUILD_FLAGS := -Wall -Wextra
 RUN_FLAGS :=
 
 VERSION_PARTS := $(subst ., ,$(shell git describe --tags --abbrev=0))
diff --git a/source/all.h b/source/all.h
index 89c4901..b7ef44f 100644
--- a/source/all.h
+++ b/source/all.h
@@ -1,9 +1,6 @@
 #include <errno.h>
 #include <stdio.h>
 
-/* Channel to play music on */
-#define CHANNEL	0x08
-
 /* Adds extra debugging text */
 //#define DEBUG
 
@@ -14,13 +11,3 @@
 
 #define delete(ptr) \
 	free((void*) ptr); ptr = NULL
-
-struct decoder_fn
-{
-	int (* init)(const char* file);
-	uint32_t (* rate)(void);
-	uint8_t (* channels)(void);
-	int buffSize;
-	uint64_t (* decode)(void*);
-	void (* exit)(void);
-};
diff --git a/source/flac.c b/source/flac.c
index 6368fea..49f922c 100644
--- a/source/flac.c
+++ b/source/flac.c
@@ -3,11 +3,11 @@
 #define DR_FLAC_IMPLEMENTATION
 #include <./dr_libs/dr_flac.h>
 
-#include "all.h"
 #include "flac.h"
+#include "playback.h"
 
 static drflac*		pFlac;
-static const int	buffSize = 16 * 1024;
+static const size_t	buffSize = 16 * 1024;
 
 /**
  * Set decoder parameters for flac.
diff --git a/source/flac.h b/source/flac.h
index dc734c9..5da31ec 100644
--- a/source/flac.h
+++ b/source/flac.h
@@ -1,3 +1,5 @@
+#include "playback.h"
+
 /**
  * Set decoder parameters for flac.
  *
diff --git a/source/main.c b/source/main.c
index 04f9b7b..013e715 100644
--- a/source/main.c
+++ b/source/main.c
@@ -32,7 +32,8 @@ static void showControls(void)
 			"Stop: L+B\n"
 			"A: Open File\n"
 			"B: Go up folder\n"
-			"Start: Exit\n");
+			"Start: Exit\n"
+			"Browse: Up, Down, Left or Right\n");
 }
 
 /**
@@ -82,6 +83,13 @@ static int changeFile(const char* ep_file, struct playbackInfo_t* playbackInfo)
 	s32 prio;
 	static Thread thread = NULL;
 	
+	if(ep_file != NULL && getFileType(ep_file) == FILE_TYPE_ERROR)
+	{
+		*playbackInfo->errInfo->error = errno;
+		svcSignalEvent(*playbackInfo->errInfo->failEvent);
+		return -1;
+	}
+
 	/**
 	 * If music is playing, stop it. Only one playback thread should be playing
 	 * at any time.
@@ -94,9 +102,6 @@ static int changeFile(const char* ep_file, struct playbackInfo_t* playbackInfo)
 		threadJoin(thread, U64_MAX);
 		threadFree(thread);
 		thread = NULL;
-
-		/* free allocated file string */
-		delete(playbackInfo->file);
 	}
 
 	if(ep_file == NULL || playbackInfo == NULL)
@@ -256,12 +261,11 @@ int main(int argc, char **argv)
 		u32			kHeld;
 		static u64	mill = 0;
 
-		hidScanInput();
-
-		gfxSwapBuffers();
 		gfxFlushBuffers();
 		gspWaitForVBlank();
+		gfxSwapBuffers();
 
+		hidScanInput();
 		kDown = hidKeysDown();
 		kHeld = hidKeysHeld();
 
@@ -343,6 +347,52 @@ int main(int argc, char **argv)
 				err_print("Unable to list directory.");
 		}
 
+		if((kDown & KEY_LEFT ||
+					((kHeld & KEY_LEFT) && (osGetTime() - mill > 500))) &&
+				fileNum > 0)
+		{
+			int skip = MAX_LIST / 2;
+
+			if(fileNum < skip)
+				skip = fileNum;
+
+			fileNum -= skip;
+
+			/* 26 is the maximum number of entries that can be printed */
+			if(fileMax - fileNum > 26 && from != 0)
+			{
+				from -= skip;
+				if(from < 0)
+					from = 0;
+			}
+
+			if(listDir(from, MAX_LIST, fileNum) < 0)
+				err_print("Unable to list directory.");
+		}
+
+		if((kDown & KEY_RIGHT ||
+					((kHeld & KEY_RIGHT) && (osGetTime() - mill > 500))) &&
+				fileNum < fileMax)
+		{
+			int skip = fileMax - fileNum;
+			
+			if(skip > MAX_LIST / 2)
+				skip = MAX_LIST / 2;
+
+			fileNum += skip;
+
+			if(fileNum >= MAX_LIST && fileMax - fileNum >= 0 &&
+					from < fileMax - MAX_LIST)
+			{
+				from += skip;
+				if(from > fileMax - MAX_LIST)
+					from = fileMax - MAX_LIST;
+			}
+
+			if(listDir(from, MAX_LIST, fileNum) < 0)
+				err_print("Unable to list directory.");
+		}
+
 		/*
 		 * Pressing B goes up a folder, as well as pressing A or R when ".."
 		 * is selected.
@@ -350,8 +400,7 @@ int main(int argc, char **argv)
 		if((kDown & KEY_B) ||
 				((kDown & KEY_A) && (from == 0 && fileNum == 0)))
 		{
-			if(chdir("..") != 0)
-				err_print("chdir");
+			chdir("..");
 
 			fileNum = 0;
 			from = 0;
diff --git a/source/mp3.c b/source/mp3.c
index 3cc1f3a..2535a22 100644
--- a/source/mp3.c
+++ b/source/mp3.c
@@ -4,10 +4,10 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "all.h"
 #include "mp3.h"
+#include "playback.h"
 
-static int*				buffSize;
+static size_t*				buffSize;
 static mpg123_handle	*mh = NULL;
 static uint32_t			rate;
 static uint8_t			channels;
diff --git a/source/mp3.h b/source/mp3.h
index 06218ca..223440a 100644
--- a/source/mp3.h
+++ b/source/mp3.h
@@ -1,3 +1,5 @@
+#include "playback.h"
+
 /**
  * Set decoder parameters for MP3.
  *
diff --git a/source/opus.c b/source/opus.c
index 8e98d88..2285f9d 100644
--- a/source/opus.c
+++ b/source/opus.c
@@ -2,12 +2,12 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "all.h"
 #include "opus.h"
+#include "playback.h"
 
 static OggOpusFile*		opusFile;
 static const OpusHead*	opusHead;
-static const int		buffSize = 32 * 1024;
+static const size_t		buffSize = 32 * 1024;
 
 /**
  * Set decoder parameters for Opus.
diff --git a/source/opus.h b/source/opus.h
index 98e2c09..4e88f02 100644
--- a/source/opus.h
+++ b/source/opus.h
@@ -1,4 +1,5 @@
 #include <opus/opusfile.h>
+#include "playback.h"
 
 void setOpus(struct decoder_fn* decoder);
 
diff --git a/source/playback.c b/source/playback.c
index 8a81b34..ed4d5eb 100644
--- a/source/playback.c
+++ b/source/playback.c
@@ -1,4 +1,5 @@
 #include <3ds.h>
+#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -46,10 +47,10 @@ bool isPlaying(void)
  * \param	file	File location.
  * \return			File type, else negative and errno set.
  */
-static int getFileType(const char *file)
+int getFileType(const char *file)
 {
 	FILE* ftest = fopen(file, "rb");
-	int fileSig = 0;
+	uint32_t fileSig;
 	enum file_types file_type = FILE_TYPE_ERROR;
 
 	/* Failure opening file */
@@ -83,7 +84,7 @@ static int getFileType(const char *file)
 			break;
 
 		// "OggS"
-		case 0x5367674f:
+		case 0x5367674F:
 			if(isOpus(file) == 0)
 				file_type = FILE_TYPE_OPUS;
 			else
@@ -135,6 +136,7 @@ void playFile(void* infoIn)
 	bool			lastbuf = false;
 	int				ret = -1;
 	const char*		file = info->file;
+	bool			isNdspInit = false;
 
 	/* Reset previous stop command */
 	stop = false;
@@ -161,12 +163,14 @@ void playFile(void* infoIn)
 			goto err;
 	}
 
-	if(R_FAILED(ndspInit()))
+	if(ndspInit() < 0)
 	{
 		errno = NDSP_INIT_FAIL;
 		goto err;
 	}
 
+	isNdspInit = true;
+
 	if((ret = (*decoder.init)(file)) != 0)
 	{
 		errno = DECODER_INIT_FAIL;
@@ -202,10 +206,6 @@ void playFile(void* infoIn)
 
 	while(stop == false)
 	{
-		gfxSwapBuffers();
-		gfxFlushBuffers();
-		gspWaitForVBlank();
-
 		svcSleepThread(100 * 1000);
 
 		/* When the last buffer has finished playing, break. */
@@ -252,8 +252,13 @@ void playFile(void* infoIn)
 
 	(*decoder.exit)();
 out:
-	ndspChnWaveBufClear(CHANNEL);
-	ndspExit();
+	if(isNdspInit == true)
+	{
+		ndspChnWaveBufClear(CHANNEL);
+		ndspExit();
+	}
+
+	delete(info->file);
 	linearFree(buffer1);
 	linearFree(buffer2);
 	threadExit(0);
diff --git a/source/playback.h b/source/playback.h
index 4779f58..2b4abda 100644
--- a/source/playback.h
+++ b/source/playback.h
@@ -1,6 +1,9 @@
 #ifndef ctrmus_playback_h
 #define ctrmus_playback_h
 
+/* Channel to play music on */
+#define CHANNEL	0x08
+
 enum file_types
 {
 	FILE_TYPE_ERROR = -1,
@@ -11,21 +14,22 @@ enum file_types
 	FILE_TYPE_MP3
 };
 
+struct decoder_fn
+{
+	int (* init)(const char* file);
+	uint32_t (* rate)(void);
+	uint8_t (* channels)(void);
+	size_t buffSize;
+	uint64_t (* decode)(void*);
+	void (* exit)(void);
+};
+
 struct playbackInfo_t
 {
 	char*				file;
 	struct errInfo_t*	errInfo;
 };
 
-/**
- * Should only be called from a new thread only, and have only one playback
- * thread at time. This function has not been written for more than one
- * playback thread in mind.
- *
- * \param	infoIn	Playback information.
- */
-void playFile(void* infoIn);
-
 /**
  * Pause or play current file.
  *
@@ -43,4 +47,21 @@ void stopPlayback(void);
  */
 bool isPlaying(void);
 
+/**
+ * Obtains file type.
+ *
+ * \param	file	File location.
+ * \return			File type, else negative and errno set.
+ */
+int getFileType(const char *file);
+
+/**
+ * Should only be called from a new thread only, and have only one playback
+ * thread at time. This function has not been written for more than one
+ * playback thread in mind.
+ *
+ * \param	infoIn	Playback information.
+ */
+void playFile(void* infoIn);
+
 #endif
diff --git a/source/wav.c b/source/wav.c
index e27f9dc..c21f700 100644
--- a/source/wav.c
+++ b/source/wav.c
@@ -3,10 +3,10 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "all.h"
 #include "wav.h"
+#include "playback.h"
 
-static const int	buffSize	= 16 * 1024;
+static const size_t	buffSize	= 16 * 1024;
 static FILE*		pWav		= NULL;
 static char			header[45];
 static uint8_t		channels;
diff --git a/source/wav.h b/source/wav.h
index 5971c21..6814a94 100644
--- a/source/wav.h
+++ b/source/wav.h
@@ -1,3 +1,5 @@
+#include "playback.h"
+
 /**
  * Set decoder parameters for WAV.
  *