diff --git a/js/rpg_core/WebAudio.js b/js/rpg_core/WebAudio.js
index 3e1cb1ec..65987120 100644
--- a/js/rpg_core/WebAudio.js
+++ b/js/rpg_core/WebAudio.js
@@ -265,17 +265,11 @@ WebAudio.prototype.clear = function() {
     this._sourceNode = null;
     this._gainNode = null;
     this._pannerNode = null;
-    this._partialArray = null;
-    this._wholeArray = null;
-    this._chunkGainRate = 5;
-    this._chunkSize = 75 * 1024;
-    this._loadedSize = 0;
     this._totalTime = 0;
     this._sampleRate = 0;
     this._loopStart = 0;
     this._loopLength = 0;
     this._startTime = 0;
-    this._offset = 0;
     this._volume = 1;
     this._pitch = 1;
     this._pan = 0;
@@ -363,7 +357,7 @@ Object.defineProperty(WebAudio.prototype, 'pan', {
  * @return {Boolean} True if the audio data is ready to play
  */
 WebAudio.prototype.isReady = function() {
-    return !!this._buffer && this._buffer.duration >= this._offset;
+    return !!this._buffer;
 };
 
 /**
@@ -394,8 +388,8 @@ WebAudio.prototype.isPlaying = function() {
  * @param {Number} offset The start position to play in seconds
  */
 WebAudio.prototype.play = function(loop, offset) {
-    this._offset = offset = offset || 0;
     if (this.isReady()) {
+        offset = offset || 0;
         this._startPlaying(loop, offset);
     } else if (WebAudio._context) {
         this._autoPlay = true;
@@ -510,9 +504,6 @@ WebAudio.prototype._load = function(url) {
         var xhr = new XMLHttpRequest();
         if(Decrypter.hasEncryptedAudio) url = Decrypter.extToEncryptExt(url);
         xhr.open('GET', url);
-        if (typeof require === 'undefined') {
-            xhr.setRequestHeader('Range', 'bytes=' + this._loadedSize + '-' + (this._loadedSize + this._chunkSize - 1));
-        }
         xhr.responseType = 'arraybuffer';
         xhr.onload = function() {
             if (xhr.status < 400) {
@@ -530,89 +521,21 @@ WebAudio.prototype._load = function(url) {
  * @private
  */
 WebAudio.prototype._onXhrLoad = function(xhr) {
-    if (xhr.status === 206) {
-        this._onPartialLoad(xhr);
-    } else {
-        this._onWholeLoad(xhr.response);
-    }
-};
-
-/**
- * @method _onPartialLoad
- * @param {XMLHttpRequest} xhr
- * @private
- */
-WebAudio.prototype._onPartialLoad = function(xhr) {
     var array = xhr.response;
-    if (!this._partialArray) {
-        this._partialArray = new Uint8Array(+xhr.getResponseHeader('Content-Range').split('/').pop());
-        this._chunkSize *= this._chunkGainRate - 1;
-    } else {
-        this._chunkSize = this._partialArray.byteLength;
-    }
-    this._partialArray.set(new Uint8Array(array), this._loadedSize);
-    this._loadedSize += array.byteLength;
-    if (this._loadedSize < this._partialArray.byteLength) {
-        array = this._partialArray.buffer.slice(0, this._loadedSize);
-        this._load(this._url);
-    } else {
-        array = this._partialArray.buffer;
-        this._partialArray = null;
-    }
-    if (Decrypter.hasEncryptedAudio) {
-        array = Decrypter.decryptArrayBuffer(array);
-    }
+    if(Decrypter.hasEncryptedAudio) array = Decrypter.decryptArrayBuffer(array);
     this._readLoopComments(new Uint8Array(array));
-    WebAudio._context.decodeAudioData(array, this._onDecode.bind(this));
-};
-
-/**
- * @method _onWholeLoad
- * @param {ArrayBuffer} array
- * @private
- */
-WebAudio.prototype._onWholeLoad = function(array) {
-    if (array) {
-        if (Decrypter.hasEncryptedAudio) {
-            array = Decrypter.decryptArrayBuffer(array);
-        }
-        this._readLoopComments(new Uint8Array(array));
-        if (this._chunkSize < array.byteLength) {
-            this._wholeArray = array;
-            array = this._wholeArray.slice(0, this._chunkSize);
-            this._chunkSize *= this._chunkGainRate;
-        }
-    } else if (this._chunkSize < this._wholeArray.byteLength) {
-        array = this._wholeArray.slice(0, this._chunkSize);
-        this._chunkSize = this._wholeArray.byteLength;
-    } else {
-        array = this._wholeArray;
-        this._wholeArray = null;
-    }
-    WebAudio._context.decodeAudioData(array, this._onDecode.bind(this), function() {
-        this._onWholeLoad();
-    }.bind(this));
-};
-
-/**
- * @method _onDecode
- * @param {AudioBuffer} buffer
- * @private
- */
-WebAudio.prototype._onDecode = function(buffer) {
-    if (!this._buffer || this._buffer.length < buffer.length) {
+    WebAudio._context.decodeAudioData(array, function(buffer) {
         this._buffer = buffer;
         this._totalTime = buffer.duration;
-        if (this.isPlaying()) {
-            this._startPlaying(this._sourceNode.loop, this.seek());
-        }
-        if (this.isReady()) {
-            this._onLoad();
-        }
-        if (this._wholeArray) {
-            this._onWholeLoad();
+        if (this._loopLength > 0 && this._sampleRate > 0) {
+            this._loopStart /= this._sampleRate;
+            this._loopLength /= this._sampleRate;
+        } else {
+            this._loopStart = 0;
+            this._loopLength = this._totalTime;
         }
-    }
+        this._onLoad();
+    }.bind(this));
 };
 
 /**
@@ -645,10 +568,8 @@ WebAudio.prototype._createNodes = function() {
     var context = WebAudio._context;
     this._sourceNode = context.createBufferSource();
     this._sourceNode.buffer = this._buffer;
-    if (this._buffer.duration > this._loopStart) {
-        this._sourceNode.loopStart = this._loopStart;
-        this._sourceNode.loopEnd = this._loopStart + this._loopLength;
-    }
+    this._sourceNode.loopStart = this._loopStart;
+    this._sourceNode.loopEnd = this._loopStart + this._loopLength;
     this._sourceNode.playbackRate.setValueAtTime(this._pitch, context.currentTime);
     this._gainNode = context.createGain();
     this._gainNode.gain.setValueAtTime(this._volume, context.currentTime);
@@ -734,14 +655,8 @@ WebAudio.prototype._onLoad = function() {
  * @private
  */
 WebAudio.prototype._readLoopComments = function(array) {
-    if (this._sampleRate === 0) {
-        this._readOgg(array);
-        this._readMp4(array);
-        if (this._loopLength > 0 && this._sampleRate > 0) {
-            this._loopStart /= this._sampleRate;
-            this._loopLength /= this._sampleRate;
-        }
-    }
+    this._readOgg(array);
+    this._readMp4(array);
 };
 
 /**
diff --git a/js/rpg_managers/AudioManager.js b/js/rpg_managers/AudioManager.js
index 9955ff5f..104b42a9 100644
--- a/js/rpg_managers/AudioManager.js
+++ b/js/rpg_managers/AudioManager.js
@@ -390,7 +390,7 @@ AudioManager.updateBufferParameters = function(buffer, configVolume, audio) {
 };
 
 AudioManager.audioFileExt = function() {
-    if (WebAudio.canPlayOgg()) {
+    if (WebAudio.canPlayOgg() && !Utils.isMobileDevice()) {
         return '.ogg';
     } else {
         return '.m4a';
diff --git a/plugins/Debug_ReportSound.js b/plugins/Debug_ReportSound.js
deleted file mode 100644
index 37217cc6..00000000
--- a/plugins/Debug_ReportSound.js
+++ /dev/null
@@ -1,149 +0,0 @@
-/*:
- * @plugindesc Show the process of loading sounds.
- * @author RM CoreScript team
- *
- * @param chunkSize
- * @type number
- * @desc the size of first loading (KB)
- * @default 75
- *
- * @param chunkGainRate
- * @type number
- * @desc the size of second loading (per chunkSize)
- * @default 5
- *
- */
-
-/*:ja
- * @plugindesc 音声読み込みの様子を表示します。
- * @author RM CoreScript team
- *
- * @param chunkSize
- * @type number
- * @desc 一回目の分割読み込みのサイズ(KB)
- * @default 75
- *
- * @param chunkGainRate
- * @type number
- * @desc 二回目の分割読み込みのサイズ(一回目の何倍のサイズかで表す)
- * @default 5
- *
- */
-
-(function(){
-    'use strict';
-    function isNumber(str) {
-        return !!str && !isNaN(str);
-    }
-
-    function toNumber(str, def) {
-        return isNumber(str) ? +str : def;
-    }
-
-    function updateInfo() {
-        var loadTime = info.loadTime.map(function(time) {
-            return time < 0 ? '(progress)' : time;
-        });
-        var decodeTime = info.decodeTime.map(function(time) {
-            return time < 0 ? '(progress)' : time;
-        });
-        var content = 'name: ' + info.url + '<br>';
-        content += 'loadingMode: ' + info.loadingMode + '<br>';
-        content += 'loadTime: ' + loadTime + '<br>';
-        content += 'decodeTime: ' + decodeTime + '<br>';
-
-        if (div.innerHTML !== content) div.innerHTML = content;
-        div.style.zIndex = 11;
-    }
-
-    var parameters = PluginManager.parameters('Debug_ReportSound');
-    var chunkSize = toNumber(parameters['chunkSize'], 75) * 1024;
-    var chunkGainRate = toNumber(parameters['chunkGainRate'], 5);
-    var info;
-
-    var div = document.createElement('div');
-    div.style.backgroundColor = 'AliceBlue';
-    div.style.position = 'fixed';
-    div.style.right = 0;
-    div.style.bottom = 0;
-    document.body.appendChild(div);
-
-    var _WebAudio_clear = WebAudio.prototype.clear;
-    WebAudio.prototype.clear = function() {
-        _WebAudio_clear.apply(this, arguments);
-        info = {
-            fastLoadEnabled: !!this._chunkSize,
-            rangeEnabled: null,
-            loadingMode: '',
-            url: '',
-            loadTime: [],
-            decodeTime: []
-        };
-        this._chunkSize = chunkSize;
-        this._chunkGainRate = chunkGainRate;
-    };
-
-    var _WebAudio__load = WebAudio.prototype._load;
-    WebAudio.prototype._load = function(url) {
-        _WebAudio__load.apply(this, arguments);
-        info.url = info.url || url;
-        if (url === info.url) {
-            info.loadTime.push(-Date.now());
-        }
-    };
-
-    if (WebAudio.prototype._onPartialLoad && WebAudio.prototype._onWholeLoad && WebAudio.prototype._onDecode) {
-        var _WebAudio__onPartialLoad = WebAudio.prototype._onPartialLoad;
-        WebAudio.prototype._onPartialLoad = function(xhr) {
-            if (this._url === info.url) {
-                info.loadingMode = 'Range Enabled<br>(load & decode multiply)';
-                info.loadTime[info.loadTime.length - 1] += Date.now();
-                info.decodeTime.push(-Date.now());
-                updateInfo();
-            }
-            _WebAudio__onPartialLoad.apply(this, arguments);
-        };
-
-        var _WebAudio__onWholeLoad = WebAudio.prototype._onWholeLoad;
-        WebAudio.prototype._onWholeLoad = function(array) {
-            if (this._url === info.url) {
-                info.loadingMode = 'Range Disabled<br>(load once, decode multiply)';
-                if (info.decodeTime.length === 0) {
-                    info.loadTime[0] += Date.now();
-                }
-                info.decodeTime.push(-Date.now());
-                updateInfo();
-            }
-            _WebAudio__onWholeLoad.apply(this, arguments);
-        };
-
-        var _WebAudio__onDecode = WebAudio.prototype._onDecode;
-        WebAudio.prototype._onDecode = function(buffer) {
-            if (this._url === info.url && info.decodeTime[info.decodeTime.length - 1] < 0) {
-                info.decodeTime[info.decodeTime.length - 1] += Date.now();
-                updateInfo();
-            }
-            _WebAudio__onDecode.apply(this, arguments);
-        };
-    } else {
-        var _WebAudio__onXhrLoad = WebAudio.prototype._onXhrLoad;
-        WebAudio.prototype._onXhrLoad = function(xhr) {
-            if (this._url === info.url) {
-                info.loadingMode = 'Legacy<br>(load & decode once)';
-                info.loadTime[0] += Date.now();
-                info.decodeTime.push(-Date.now());
-                updateInfo();
-            }
-            _WebAudio__onXhrLoad.apply(this, arguments);
-        };
-
-        var _WebAudio__onLoad = WebAudio.prototype._onLoad;
-        WebAudio.prototype._onLoad = function() {
-            if (this._url === info.url && info.decodeTime[info.decodeTime.length - 1] < 0) {
-                info.decodeTime[info.decodeTime.length - 1] += Date.now();
-                updateInfo();
-            }
-            _WebAudio__onLoad.apply(this, arguments);
-        };
-    }
-})();
\ No newline at end of file