i put pulseaudio, but i probably didn't do correctly while it makes reicast crash.
reicast and ppsspp and exactly the same sound options, strange, so i'm still not sure where the but is (reicast/ppsspp or system configuration).
When i change the sample rate from 44100 to 24000 for example in reciast, the bad sound disappear, but of course the fps and game become slow because it's based on the sound. i think that reicast doesn't play (alsa plugin) at the correct sample rate in my case.
glibc is used (not uclibc)
gcc 5.x is used. i will make a try in 7.x. but can you confirm it's for performances issues ?
changing gcc is not always easy while often, some programs doesn't support it (i build all the distro with the same gcc) and i've to fix it.
i'm still looking for the solution for the sound.
@michel83 did you test reicast or ppsspp for the sound ? for reicast, just the dreamcast aniamtion at boot is crappy.