> I just provided the files to you via YouSendIt. You should be receiving an > e-mail with a link to them. Thanks in advance for your help. the mysterious 300HZ.wav is not a pure 300Hz tone; it plays distorted (on ALSA and PA) because the signal is distorted when you look at it in Audacity (Analyze -> Plot Spectrum) you see plenty of frequency components besides 300Hz; you can generate a pure 300Hz tone using Generate -> Tone and compare I do not know why ALSA and PA sounds differently for you, it might be resampling regards, p. -- Peter Meerwald +43-664-2444418 (mobile)