OK folks, I checked out where this 'alex793' posts on (gueux-forum.net/index.php?showuser=28647), and it appears in one post he tells us of the changes he made to fix the sound (as I already suspected, the culprit was SNES9x itself and the way it was configured - this bodes well for PS3 porting as we can get complex emulators to work without much hassle or effort involved).
You need to add this to the Settings (the file you need to edit is cell.cpp - it's the only file that the author of this port actually wrote and is PS3-specific, except for the shader files and the Makefile):
Lastly, there was what appeared to be an SRAM lag that I assume was causing the sound to lag and crackle. To fix this, change:
Settings.SoundSync = TRUE;
Settings.AutoSaveDelay = 5
Here is my own addition - so that the emulator can read SFC files.
Settings.AutoSaveDelay = 0;
Change this in cell.cpp:
if (strcasecmp(ext, ".smc") && strcasecmp(ext, ".fig"))
So, I'd say try out these source changes without fiddling around with the PAL and NTSC settings, and see if that takes care of the sound problems.
if (strcasecmp(ext, ".smc") && strcasecmp(ext, ".fig") && strcasecmp(ext, ".sfc"))