diff --git a/include/sndcore2/core.h b/include/sndcore2/core.h
index c4f1c73..19a4dbd 100644
--- a/include/sndcore2/core.h
+++ b/include/sndcore2/core.h
@@ -77,6 +77,9 @@ AXSetDefaultMixerSelect(uint32_t unk0);
 AXResult
 AXRegisterAppFrameCallback(AXFrameCallback callback);
 
+AXFrameCallback
+AXRegisterFrameCallback(AXFrameCallback callback);
+
 uint32_t
 AXGetInputSamplesPerFrame();
 
diff --git a/include/sndcore2/voice.h b/include/sndcore2/voice.h
index 667b712..f4fd243 100644
--- a/include/sndcore2/voice.h
+++ b/include/sndcore2/voice.h
@@ -253,6 +253,12 @@ WUT_CHECK_SIZE(AXVoiceSrc, 0xe);
 
 #pragma pack(pop)
 
+int32_t
+AXVoiceBegin(AXVoice *v);
+
+int32_t
+AXVoiceEnd(AXVoice *v);
+
 AXVoice *
 AXAcquireVoice(uint32_t priority,
                AXVoiceCallbackFn callback,