I wrote a library function using the waveOut... family of functions to play data to a sound card. There''s this weird thumping or clicking noise when the sound starts & when it stops. It seems to me I''ve heard several programs do this, but some (WinAmp, etc.) obviously do not. I figure it could be an impulse step in the waveform, going from one PCM value of silence to another, but that''s just the DSP engineer in me talking. My question is: does anybody know how to get around this annoying sound? I could goof around with sample padding, pausing after open, etc., but I''d like to know definitively where this comes from. Also, I don''t think it happens on all sound cards. Weird.