This thread may help.originally posted by Adair
Well the sound in MGS is going to be messed up no matter what, but maybe someone who's played it recently can help somewhat. For the 150fps just go into Pete's plugin config and check the FPS limit box and then choose whether you want auto limit or you can set a custom limit(50 for PAL, 60 for NTSC). Some people have said that MGS runs slow at the regular setting and have limited the fps at 80. Others use the special game fix called "use PC fps calculation"(its normal to get about 30fps with this setting). Getting MGS to run the right speed may also help with sound issues.
BTW the sound in MGS is messed up because of a timing error in the programming of ePSXe(not the plugin's fault)