diff --git a/packages/react-native-audio-api/src/core/AudioBuffer.ts b/packages/react-native-audio-api/src/core/AudioBuffer.ts
index 713ead88..7df3045d 100644
--- a/packages/react-native-audio-api/src/core/AudioBuffer.ts
+++ b/packages/react-native-audio-api/src/core/AudioBuffer.ts
@@ -23,7 +23,7 @@ export default class AudioBuffer {
   public copyFromChannel(
     destination: number[],
     channelNumber: number,
-    startInChannel: number
+    startInChannel: number = 0
   ): void {
     this.buffer.copyFromChannel(destination, channelNumber, startInChannel);
   }
@@ -31,7 +31,7 @@ export default class AudioBuffer {
   public copyToChannel(
     source: number[],
     channelNumber: number,
-    startInChannel: number
+    startInChannel: number = 0
   ): void {
     this.buffer.copyToChannel(source, channelNumber, startInChannel);
   }
diff --git a/packages/react-native-audio-api/src/core/AudioScheduledSourceNode.ts b/packages/react-native-audio-api/src/core/AudioScheduledSourceNode.ts
index 32ec9c46..3b147425 100644
--- a/packages/react-native-audio-api/src/core/AudioScheduledSourceNode.ts
+++ b/packages/react-native-audio-api/src/core/AudioScheduledSourceNode.ts
@@ -7,11 +7,11 @@ export default class AudioScheduledSourceNode extends AudioNode {
     super(context, node);
   }
 
-  public start(time: number): void {
-    (this.node as IAudioScheduledSourceNode).start(time);
+  public start(when: number = 0): void {
+    (this.node as IAudioScheduledSourceNode).start(when);
   }
 
-  public stop(time: number): void {
-    (this.node as IAudioScheduledSourceNode).stop(time);
+  public stop(when: number = 0): void {
+    (this.node as IAudioScheduledSourceNode).stop(when);
   }
 }