I've upgraded to AHI6.0 RC3 (ahi.device 6.2 (04/03/2005)). I've tried it, but there is the same effect. If I select the "Unit 0" on the first page of AHI prefs, the sound quality gets worse. There is a little "ambient noise" (I can hear it with SongPlayer at high volumes, but MPlayer is much worse: frequently I can't hear the movie's own sound from the noise. ). If I set "Pegasos: Hifi 16bit Stereo++" mode, then everything is fine, thre is no noise, but the system freezes, if I want to use AHI in two programs at the same time.

(If I set Volume Scaling in AHI prefs other than "Full volume", the sound is too low even at full volume on my amplifier.)