First always use the lateset drivers
Check AHI prefs I use sb128:hifi 16bit stereo++
afreq= 48000hz
I also use soundt v41
although my setup is a bit slow at times i dont get any hiss
amiga 1200 060
have a great day
denby
another thing to check is
on mediator graphics card in first port
sound card in port 2 or 3
hope this helps