I am also experiencing the same type of issues with most PSX games. I have nearly the exact same config as neighbourhood nerd with a new PI2.
– I’ve tried changing the audio codecs even with very little difference.
– Tried changing the audio bitrate
– Tried changing options in rgui in game to find differences
– Setting process priority to retroarch process
– Other things that were mentioned in the post above
The best I got was less noise, but sometimes the audio would just drop completely. Looking at top process tree from inside of my SSH connection when playing a game shows not that much processor being used, but still no matter what I try, I get crackly sound – only on PSX games. Some are better than others. One of the worst is the Legend of Dragoon during cutscenes and during dragoon transformations. Final Fantasy VII seems to be working pretty solid though.
Does anyone have best settings for sound? If so, please share!