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No, I really mean the low level stuff!
Programming the following sound APIs in C++ work fine from XP through to 8, whether they are the 32 or 64-bit OS :-
waveInUnprepareHeader
waveInPrepareHeader
waveInAddBuffer
waveInGetErrorText
waveInOpen
waveInStart
waveInReset
waveInClose
waveOutUnprepareHeader
waveOutReset
waveOutClose
waveOutPrepareHeader
waveOutWrite
waveOutOpen
Updated - 5th Feb