diff --git a/stepmania/src/RageSoundReader_Chain.cpp b/stepmania/src/RageSoundReader_Chain.cpp
index aae3a46e93..35384a2859 100644
--- a/stepmania/src/RageSoundReader_Chain.cpp
+++ b/stepmania/src/RageSoundReader_Chain.cpp
@@ -224,6 +224,35 @@ bool RageSoundReader_Chain::IsStreamingFromDisk() const
 	return false;
 }
 
+int RageSoundReader_Chain::GetNextStreamFrame() const
+{
+	return m_iCurrentFrame;
+/*	int iPosition = m_apActiveSounds[0].pSound->GetPosition();
+	for( unsigned i = 1; i < m_apActiveSounds.size(); )
+	{
+		if( m_apActiveSounds[i].pSound->GetPosition() != iPosition )
+			LOG->Warn( "RageSoundReader_Chain: sound positions moving at different rates" );
+	}
+
+	return iPosition;
+*/
+}
+
+float RageSoundReader_Chain::GetStreamToSourceRatio() const
+{
+	if( m_apActiveSounds.empty() )
+		return 1.0f;
+
+	float iRate = m_apActiveSounds[0].pSound->GetStreamToSourceRatio();
+	for( unsigned i = 1; i < m_apActiveSounds.size(); )
+	{
+		if( m_apActiveSounds[i].pSound->GetStreamToSourceRatio() != iRate )
+			LOG->Warn( "RageSoundReader_Chain: sound rates changing differently" );
+	}
+
+	return iRate;
+}
+
 /* Find the next sound we'll need to start, if any.  m_Sounds is sorted by time. */
 unsigned RageSoundReader_Chain::GetNextSoundIndex() const
 {
diff --git a/stepmania/src/RageSoundReader_Chain.h b/stepmania/src/RageSoundReader_Chain.h
index 13ee94ee72..78d42d6828 100644
--- a/stepmania/src/RageSoundReader_Chain.h
+++ b/stepmania/src/RageSoundReader_Chain.h
@@ -36,6 +36,8 @@ public:
 	int GetSampleRate() const { return m_iActualSampleRate; }
 	unsigned GetNumChannels() const { return m_iChannels; }
 	bool IsStreamingFromDisk() const;
+	int GetNextStreamFrame() const;
+	float GetStreamToSourceRatio() const;
 
 private:
 	int ReadBlock( int16_t *pBuffer, int iFrames );
diff --git a/stepmania/src/RageSoundReader_Preload.cpp b/stepmania/src/RageSoundReader_Preload.cpp
index 7bc44117f6..2b5cfc58a0 100644
--- a/stepmania/src/RageSoundReader_Preload.cpp
+++ b/stepmania/src/RageSoundReader_Preload.cpp
@@ -4,7 +4,7 @@
 #include "global.h"
 #include "RageSoundReader_Preload.h"
 
-#define samplesize (2 * m_iChannels) /* 16-bit */
+#define samplesize (sizeof(int16_t) * m_iChannels) /* 16-bit */
 
 /* If a sound is smaller than this, we'll load it entirely into memory. */
 const unsigned max_prebuf_size = 1024*256;
@@ -39,6 +39,7 @@ bool RageSoundReader_Preload::Open( SoundReader *pSource )
 	ASSERT( pSource );
 	m_iSampleRate = pSource->GetSampleRate();
 	m_iChannels = pSource->GetNumChannels();
+	m_fRate = pSource->GetStreamToSourceRatio();
 	
 	/* Check the length, and see if we think it'll fit in the buffer. */
 	int iLen = pSource->GetLength_Fast();
@@ -55,6 +56,10 @@ bool RageSoundReader_Preload::Open( SoundReader *pSource )
 
 	while(1)
 	{
+		/* If the rate changes, we won't preload it. */
+		if( pSource->GetStreamToSourceRatio() != m_fRate )
+			return false; /* Don't bother trying to preload it. */
+
 		char buffer[1024];
 		int iCnt = pSource->Read(buffer, sizeof(buffer));
 
@@ -109,6 +114,11 @@ int RageSoundReader_Preload::SetPosition_Fast( int iMS )
 	return SetPosition_Accurate( iMS );
 }
 
+int RageSoundReader_Preload::GetNextStreamFrame() const
+{
+	return m_iPosition / samplesize;
+}
+
 int RageSoundReader_Preload::Read( char *pBuffer, unsigned iLen )
 {
 	const unsigned bytes_avail = m_Buffer->size() - m_iPosition;
diff --git a/stepmania/src/RageSoundReader_Preload.h b/stepmania/src/RageSoundReader_Preload.h
index f09c753139..afd2a2fe3a 100644
--- a/stepmania/src/RageSoundReader_Preload.h
+++ b/stepmania/src/RageSoundReader_Preload.h
@@ -21,6 +21,8 @@ public:
 	int GetSampleRate() const { return m_iSampleRate; }
 	unsigned GetNumChannels() const { return m_iChannels; }
 	bool IsStreamingFromDisk() const { return false; }
+	int GetNextStreamFrame() const;
+	float GetStreamToSourceRatio() const { return m_fRate; }
 
 	/* Return the total number of copies of this sound.  (If 1 is returned,
 	 * this is the last copy.) */
@@ -42,6 +44,7 @@ private:
 
 	int m_iSampleRate;
 	unsigned m_iChannels;
+	float m_fRate;
 };
 
 #endif