diff --git a/Source/Project64-audio/Driver/SoundBase.cpp b/Source/Project64-audio/Driver/SoundBase.cpp
index 52961921d..1293abd4a 100644
--- a/Source/Project64-audio/Driver/SoundBase.cpp
+++ b/Source/Project64-audio/Driver/SoundBase.cpp
@@ -182,6 +182,11 @@ void SoundDriverBase::BufferAudio()
     WriteTrace(TraceAudioDriver, TraceVerbose, "Done (m_BufferRemaining: 0x%08X)", m_BufferRemaining);
 }
 
+uint32_t SoundDriverBase::AI_ReadLength()
+{
+	return (m_AI_DMAPrimaryBytes & ~ 3);
+}
+
 void SoundDriverBase::SetFrequency(uint32_t /*Frequency*/)
 {
 }
@@ -192,4 +197,4 @@ void SoundDriverBase::StartAudio()
 
 void SoundDriverBase::StopAudio()
 {
-}
\ No newline at end of file
+}