增加测试文件，修改buffer size解决淡变时会爆音的问题

Assets/Resources/Audios/music_home.wav.meta

@@ -1,17 +1,17 @@
 fileFormatVersion: 2
-guid: 0279ce4eacbbf45d0b332f1996c7715c
+guid: 49b7f87b4607c4005aa6739e4a777f60
 AudioImporter:
   externalObjects: {}
   serializedVersion: 7
   defaultSettings:
     serializedVersion: 2
-    loadType: 2
-    sampleRateSetting: 2
+    loadType: 0
+    sampleRateSetting: 0
     sampleRateOverride: 44100
     compressionFormat: 1
-    quality: 0.13
+    quality: 1
     conversionMode: 0
-    preloadAudioData: 1
+    preloadAudioData: 0
   platformSettingOverrides: {}
   forceToMono: 0
   normalize: 1

Assets/Scenes/SampleScene.unity

@@ -2882,7 +2882,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   startWithMusic: 1
-  startMusicWith: 1
+  startMusicWith: 0
   logLevel: 0
   extendSettings: {fileID: 11400000, guid: de80878c933394e2da0966a1466fd793, type: 2}
 --- !u!4 &2093584671

ProjectSettings/AudioManager.asset

@@ -9,7 +9,7 @@ AudioManager:
   Doppler Factor: 1
   Default Speaker Mode: 2
   m_SampleRate: 44100
-  m_DSPBufferSize: 256
+  m_DSPBufferSize: 512
   m_VirtualVoiceCount: 512
   m_RealVoiceCount: 32
   m_EnableOutputSuspension: 0
@@ -17,4 +17,4 @@ AudioManager:
   m_AmbisonicDecoderPlugin: 
   m_DisableAudio: 0
   m_VirtualizeEffects: 1
-  m_RequestedDSPBufferSize: 256
+  m_RequestedDSPBufferSize: 512