PREFSMAN->m_iSoundPreferredSampleRate == 0 means "do what's right for the hardware". We want a 44.1khz default for most systems, but KS should default to 48khz.

stepmania/src/arch/Sound/ALSA9Helpers.cpp

@@ -15,6 +15,9 @@
  * samplerate to use instead. */
 unsigned Alsa9Buf::FindSampleRate( unsigned rate )
 {
+	if( rate == 0 )
+		rate = 44100;
+
 	snd_pcm_hw_params_t *testhw;
 	dsnd_pcm_hw_params_alloca( &testhw );
 	dsnd_pcm_hw_params_any( pcm, testhw );

stepmania/src/arch/Sound/RageSoundDriver_AU.cpp

@@ -88,6 +88,8 @@ RString RageSound_AU::Init()
 	AudioStreamBasicDescription streamFormat;
 	
 	streamFormat.mSampleRate = PREFSMAN->m_iSoundPreferredSampleRate;
+	if( streamFormat.mSampleRate == 0 )
+		streamFormat.mSampleRate = 44100;
 	streamFormat.mFormatID = kAudioFormatLinearPCM;
 	streamFormat.mFormatFlags = kFormatFlags;
 	streamFormat.mBytesPerPacket = kBytesPerPacket;

stepmania/src/arch/Sound/RageSoundDriver_CA.cpp

@@ -160,6 +160,8 @@ RString RageSound_CA::Init()
 	UInt32 iFirstChannel = min( channels[0], channels[1] );
 	
 	m_iSampleRate = PREFSMAN->m_iSoundPreferredSampleRate;
+	if( m_iSampleRate == 0 )
+		m_iSampleRate = 44100;
 	Float64 nominalSampleRate = m_iSampleRate;
 	Float64 actualSampleRate;
 	

stepmania/src/arch/Sound/RageSoundDriver_DSound_Software.cpp

@@ -95,6 +95,8 @@ RString RageSound_DSound_Software::Init()
 	/* Create a DirectSound stream, but don't force it into hardware. */
 	m_pPCM = new DSoundBuf;
 	m_iSampleRate = PREFSMAN->m_iSoundPreferredSampleRate;
+	if( m_iSampleRate == 0 )
+		m_iSampleRate = 44100;
 	sError = m_pPCM->Init( ds, DSoundBuf::HW_DONT_CARE, channels, m_iSampleRate, 16, g_iMaxWriteahead );
 	if( sError != "" )
 		return sError;

stepmania/src/arch/Sound/RageSoundDriver_Null.cpp

@@ -29,6 +29,8 @@ int64_t RageSound_Null::GetPosition( const RageSoundBase *snd ) const
 RageSound_Null::RageSound_Null()
 {
 	m_iSampleRate = PREFSMAN->m_iSoundPreferredSampleRate;
+	if( m_iSampleRate == 0 )
+		m_iSampleRate = 44100;
 	m_iLastCursorPos = GetPosition( NULL );
 	StartDecodeThread();
 }

stepmania/src/arch/Sound/RageSoundDriver_WaveOut.cpp

@@ -111,11 +111,14 @@ RageSound_WaveOut::RageSound_WaveOut()
 
 RString RageSound_WaveOut::Init()
 {
+	m_iSampleRate = PREFSMAN->m_iSoundPreferredSampleRate;
+	if( m_iSampleRate == 0 )
+		m_iSampleRate = 44100;
+
 	WAVEFORMATEX fmt;
 	fmt.wFormatTag = WAVE_FORMAT_PCM;
 	fmt.nChannels = channels;
 	fmt.cbSize = 0;
-	m_iSampleRate = PREFSMAN->m_iSoundPreferredSampleRate;
 	fmt.nSamplesPerSec = m_iSampleRate;
 	fmt.wBitsPerSample = 16;
 	fmt.nBlockAlign = fmt.nChannels * fmt.wBitsPerSample / 8;

stepmania/src/arch/Sound/RageSoundDriver_Win32KernelStreaming.cpp

@@ -710,7 +710,8 @@ WinWdmPin *WinWdmFilter::InstantiateRenderPin(
 			}
 		}
 
-		aSampleRates.push_back( iPreferredSampleRate );
+		if( iPreferredSampleRate != 0 )
+			aSampleRates.push_back( iPreferredSampleRate );
 		aSampleRates.push_back( 48000 );
 		aSampleRates.push_back( 44100 );
 
@@ -720,7 +721,8 @@ WinWdmPin *WinWdmFilter::InstantiateRenderPin(
 
 		MoveToBeginning( aSampleRates, 44100 );
 		MoveToBeginning( aSampleRates, 48000 );
-		MoveToBeginning( aSampleRates, iPreferredSampleRate );
+		if( iPreferredSampleRate != 0 )
+			MoveToBeginning( aSampleRates, iPreferredSampleRate );
 	}
 
 	/* Try WAVE_FORMAT_EXTENSIBLE, then WAVE_FORMAT_PCM. */