diff --git a/src/constants/coreConstants.ts b/src/constants/coreConstants.ts
index a1d36b4..b755357 100644
--- a/src/constants/coreConstants.ts
+++ b/src/constants/coreConstants.ts
@@ -62,7 +62,7 @@ export const KEY_SIGNATURE_MAP = {
 // };
 
 export const AUDIO_INTERFACE_CONSTANTS = {
-  DEFAULT_MASTER_VOLUME: 0.8,
+  DEFAULT_MASTER_VOLUME: 1.0,
   DEFAULT_TRACK_VOLUME: 0,   // 0 dB (unity gain)
   MIN_TRACK_VOLUME_DB: -60,  // practical floor; displayed as −∞
   MAX_TRACK_VOLUME_DB: 12,
diff --git a/src/test/utils/mock-data.ts b/src/test/utils/mock-data.ts
index 9024bcf..a8427fe 100644
--- a/src/test/utils/mock-data.ts
+++ b/src/test/utils/mock-data.ts
@@ -120,7 +120,7 @@ export const createMockMidiTrack = (overrides: Partial<{
     name: 'Test Track',
     id: 0,
     instrument: 'acoustic_grand_piano' as const,
-    volume: 0.8,
+    volume: 0,
     ...overrides
   };
   
diff --git a/src/test/utils/setup-integration-tests.ts b/src/test/utils/setup-integration-tests.ts
index 5a60f65..3e860c1 100644
--- a/src/test/utils/setup-integration-tests.ts
+++ b/src/test/utils/setup-integration-tests.ts
@@ -81,7 +81,7 @@ export const createMockTrack = (name = 'Test Track') => {
     id: `track-${Date.now()}`,
     name,
     instrument: 'acoustic_grand_piano',
-    volume: 0.8,
+    volume: 0,
     regions: [],
   };
 };
@@ -104,4 +104,4 @@ export const createMockNote = (pitch = 60, startBeat = 0, endBeat = 1) => {
     endBeat,
     velocity: 100,
   };
-};
\ No newline at end of file
+};