diff --git a/src/mami.js/audio/buffer.js b/src/mami.js/audio/buffer.js
index 6abf101..8f5868a 100644
--- a/src/mami.js/audio/buffer.js
+++ b/src/mami.js/audio/buffer.js
@@ -1,6 +1,5 @@
 const MamiAudioBuffer = function(ctx, buffer) {
     return {
-        getBuffer: () => buffer,
         createSource: () => ctx.createSource(buffer),
     };
 };
diff --git a/src/mami.js/audio/context.js b/src/mami.js/audio/context.js
index 10a6439..6d5de3a 100644
--- a/src/mami.js/audio/context.js
+++ b/src/mami.js/audio/context.js
@@ -5,53 +5,75 @@
 const MamiAudioContext = function() {
     const pub = {};
 
-    let volume = null;
+    let volume;
     let isMuted = false;
 
     const ctxArgs = { latencyHint: 'playback' };
-    let ctx = null;
-    let mainGain = null;
-    const init = () => {
+    let ctx, mainGain;
+
+    const onReset = [];
+
+    const reset = () => {
         const audObj = window.AudioContext || window.webkitAudioContext;
         try {
             ctx = new audObj(ctxArgs);
         } catch(ex) {
             ctx = new audObj;
         }
+
         mainGain = ctx.createGain();
 
-        if(volume === null) {
+        if(volume === undefined) {
             volume = mainGain.gain.defaultValue;
             isMuted = false;
         } else
             mainGain.gain.value = isMuted ? 0 : volume;
 
         mainGain.connect(ctx.destination);
+
+        for(const handler of onReset)
+            handler();
     };
 
-    init();
+    reset();
 
-    pub.getContext = () => ctx;
-    pub.resetContext = init;
+    pub.getAudioContext = () => ctx;
+    pub.getAudioContextGain = () => mainGain;
+
+    pub.isReady = () => ctx !== undefined;
+    pub.reset = reset;
+
+    pub.onReset = handler => {
+        if(!onReset.includes(handler))
+            onReset.push(handler);
+    };
 
     pub.getVolume = () => volume;
     pub.setVolume = vol => {
         volume = vol;
-        if(!isMuted)
+        if(!isMuted && mainGain !== undefined)
             mainGain.gain.value = volume;
     };
     pub.isMuted = () => isMuted;
     pub.setMuted = mute => {
-        mainGain.gain.value = (isMuted = mute) ? 0 : volume;
+        isMuted = mute;
+        if(mainGain !== undefined)
+            mainGain.gain.value = isMuted ? 0 : volume;
     };
 
     pub.createBuffer = async url => {
+        if(ctx === undefined)
+            return new MamiAudioBuffer(pub);
+
         const result = await $x.get(url, { type: 'arraybuffer' });
         const buffer = await ctx.decodeAudioData(result.body());
         return new MamiAudioBuffer(pub, buffer);
     };
 
     pub.createSource = buffer => {
+        if(ctx === undefined)
+            return new MamiAudioSourceDummy;
+
         const gain = ctx.createGain();
         gain.connect(mainGain);
 
diff --git a/src/mami.js/audio/source.js b/src/mami.js/audio/source.js
index 67ba16b..6c3b4f1 100644
--- a/src/mami.js/audio/source.js
+++ b/src/mami.js/audio/source.js
@@ -1,3 +1,19 @@
+const MamiAudioSourceDummy = function() {
+    return {
+        play: async () => {},
+        stop: () => {},
+        getRate: () => 0,
+        setRate: rate => {},
+        getDetune: () => 0,
+        setDetune: rate => {},
+        getVolume: () => 0,
+        setVolume: volume => {},
+        isMuted: () => true,
+        setMuted: mute => {},
+        setLoop: (loop, start, end) => {},
+    };
+};
+
 const MamiAudioSource = function(source, gain, buffer) {
     const pub = {};
 
@@ -6,8 +22,6 @@ const MamiAudioSource = function(source, gain, buffer) {
 
     let hasDisconnected = false;
 
-    pub.getSource = () => source;
-
     const play = () => {
         return new Promise(resolve => {
             source.addEventListener('ended', () => resolve());
diff --git a/src/mami.js/context.js b/src/mami.js/context.js
index 4078c33..010d109 100644
--- a/src/mami.js/context.js
+++ b/src/mami.js/context.js
@@ -17,41 +17,20 @@ const MamiContext = function(targetBody) {
     const viewsCtx = new MamiViewsControl({ body: targetBody });
     pub.getViews = () => viewsCtx;
 
-    let audioCtx = null;
-    pub.hasAudio = function() { return audioCtx !== null; };
-    pub.getAudio = function() { return audioCtx; };
-    const initAudio = function() {
-        if(audioCtx !== null)
-            return;
+    const audioCtx = new MamiAudioContext;
+    pub.getAudio = () => audioCtx;
 
-        audioCtx = new MamiAudioContext;
-    };
-    pub.initAudio = initAudio;
+    const soundMgr = new MamiSoundManager(audioCtx);
+    const soundLib = new MamiSoundLibrary;
+    const soundPck = new MamiSoundPacks;
+    const sndPckPlay = new MamiSoundPackPlayer(soundMgr, soundLib);
 
-    let soundMgr = null;
-    let sndPckPlay = null;
-    const soundLib = new MamiSoundLibrary();
-    const soundPck = new MamiSoundPacks();
-
-    pub.initSound = function() {
-        if(soundMgr !== null)
-            return;
-
-        initAudio();
-        soundMgr = new MamiSoundManager(audioCtx);
-        sndPckPlay = new MamiSoundPackPlayer(soundMgr, soundLib);
-    };
-
-    pub.getSound = function() { return soundMgr; };
-    pub.hasSound = function() { return soundMgr !== null; };
-    pub.getSoundLibrary = function() { return soundLib; };
-    pub.getSoundPacks = function() { return soundPck; };
-    pub.getSoundPackPlayer = function() { return sndPckPlay; };
+    pub.getSound = () => soundMgr;
+    pub.getSoundLibrary = () => soundLib;
+    pub.getSoundPacks = () => soundPck;
+    pub.getSoundPackPlayer = () => sndPckPlay;
 
     pub.playLibrarySound = async (name, volume, rate) => {
-        if(soundMgr === null)
-            return;
-
         const buffer = await soundMgr.load(soundLib.getSoundSources(name));
         const source = buffer.createSource();
 
@@ -65,12 +44,12 @@ const MamiContext = function(targetBody) {
     };
 
     const txtTriggers =  new MamiTextTriggers;
-    pub.getTextTriggers = function() { return txtTriggers; };
+    pub.getTextTriggers = () => txtTriggers;
 
     let eeprom;
     pub.hasEEPROM = () => eeprom !== undefined;
     pub.getEEPROM = () => eeprom;
-    pub.createEEPROM = function() {
+    pub.createEEPROM = () => {
         if(eeprom !== undefined)
             return;
 
diff --git a/src/mami.js/main.js b/src/mami.js/main.js
index 6377f72..8a0bc50 100644
--- a/src/mami.js/main.js
+++ b/src/mami.js/main.js
@@ -157,8 +157,10 @@ const Umi = { UI: {} };
     }
 
     settings.watch('soundEnable', (v, n, i) => {
-        if(v && !mami.hasSound()) {
-            mami.initSound();
+        if(v) {
+            const audio = mami.getAudio();
+            if(!audio.isReady())
+                audio.reset();
 
             settings.touch('soundVolume');
             settings.touch('soundPack');
@@ -168,8 +170,7 @@ const Umi = { UI: {} };
                 player.playEvent('server');
         }
 
-        if(mami.hasAudio())
-            mami.getAudio().setMuted(!v);
+        mami.getAudio().setMuted(!v);
     });
 
     settings.watch('soundPack', (v, n, i) => {
@@ -187,8 +188,7 @@ const Umi = { UI: {} };
     });
 
     settings.watch('soundVolume', v => {
-        if(mami.hasAudio())
-            mami.getAudio().setVolume(v / 100);
+        mami.getAudio().setVolume(v / 100);
     })
 
 
@@ -248,10 +248,12 @@ const Umi = { UI: {} };
     settings.watch('tmpDisableOldThemeSys', (v, n, i) => { if(!i) Umi.UI.View.AccentReload(); });
 
     settings.watch('minecraft', (v, n, i) => {
-        if(i)
-            mami.playLibrarySound('minecraft:nether:enter');
-        else
-            Umi.Sound.Play('join');
+        if(v !== 'no') {
+            if(i)
+                mami.playLibrarySound('minecraft:nether:enter');
+            else
+                Umi.Sound.Play('join');
+        }
     });
 
     settings.watch('enableNotifications', v => {
diff --git a/src/mami.js/sockchat_old.js b/src/mami.js/sockchat_old.js
index 9325570..d798478 100644
--- a/src/mami.js/sockchat_old.js
+++ b/src/mami.js/sockchat_old.js
@@ -105,9 +105,6 @@ Umi.Protocol.SockChat.Protocol = function(views, settings) {
         await mami.playLibrarySound('touhou:pichuun');
     };
     const playBannedBgm = async preload => {
-        if(!mami.hasSound())
-            return;
-
         const soundMgr = mami.getSound();
         const soundLib = mami.getSoundLibrary();
 
diff --git a/src/mami.js/sound/sndmgr.js b/src/mami.js/sound/sndmgr.js
index 3871109..15973cb 100644
--- a/src/mami.js/sound/sndmgr.js
+++ b/src/mami.js/sound/sndmgr.js
@@ -1,6 +1,4 @@
 #include utility.js
-#include sound/sndlibrary.js
-#include sound/sndpacks.js
 
 const MamiSoundManager = function(context) {
     const probablySupported = [];
@@ -13,8 +11,6 @@ const MamiSoundManager = function(context) {
         wav: 'audio/wav',
     };
 
-    const loaded = new Map;
-
     (() => {
         const elem = $e('audio');
         for(const name in formats) {
@@ -28,9 +24,7 @@ const MamiSoundManager = function(context) {
         }
     })();
 
-    const pub = {};
-
-    const extractSupportedUrl = urls => {
+    const extractUrl = urls => {
         if(typeof urls === 'object' && typeof urls.getSources === 'function')
             urls = urls.getSources();
 
@@ -48,25 +42,26 @@ const MamiSoundManager = function(context) {
         throw 'No supported audio format could be determined.';
     };
 
-    pub.load = async urls => {
-        const url = extractSupportedUrl(urls);
+    const loaded = new Map;
+    context.onReset(() => loaded.clear());
 
-        if(loaded.has(url))
-            return loaded.get(url);
+    return {
+        load: async urls => {
+            const url = extractUrl(urls);
 
-        const buffer = await context.createBuffer(url);
-        loaded.set(url, buffer);
+            if(loaded.has(url))
+                return loaded.get(url);
 
-        return buffer;
+            const buffer = await context.createBuffer(url);
+            loaded.set(url, buffer);
+
+            return buffer;
+        },
+        unload: urls => {
+            loaded.delete(extractUrl(urls));
+        },
+        reset: () => {
+            loaded.clear();
+        },
     };
-
-    pub.unload = urls => {
-        loaded.delete(extractSupportedUrl(urls));
-    };
-
-    pub.reset = () => {
-        loaded.clear();
-    };
-
-    return pub;
 };
diff --git a/src/mami.js/sound/umisound.js b/src/mami.js/sound/umisound.js
index e19b82a..254f79c 100644
--- a/src/mami.js/sound/umisound.js
+++ b/src/mami.js/sound/umisound.js
@@ -5,7 +5,7 @@
 Umi.Sound = (() => {
     return {
         Play: sound => {
-            if(!sound || sound === 'none' || !mami.hasSound())
+            if(!sound || sound === 'none')
                 return;
 
             const settings = mami.getSettings();
diff --git a/src/mami.js/ui/settings.jsx b/src/mami.js/ui/settings.jsx
index f39e7a9..a1edb96 100644
--- a/src/mami.js/ui/settings.jsx
+++ b/src/mami.js/ui/settings.jsx
@@ -396,6 +396,13 @@ Umi.UI.Settings = (function() {
                         button.disabled = false;
                     },
                 },
+                {
+                    title: 'Reset audio context',
+                    type: 'button',
+                    invoke: async () => {
+                        mami.getAudio().reset();
+                    },
+                },
             ],
         }
     ];