Lewpys glide only works for voodoo cards.. But petes pluggin settings aren't that much different from lewpys.. They just use different names for some functions.. In petes pluggin there is a special fix to get the correct framerate in mgs.. "use pc framerate" You noticed that I am using petes midus spu.. Its rather old but seems to work the best for me at lessenning the skippy and laggy sounds when the realtime scenes play.. I think its probably because petes has a "xa smoothing" option in that pluggin that helps with it a little... Of course some sounds don't sound correct but not so much to interfere with gameplay.. (when you hit the wall with your hand)
Plus as you can see, I have disabled mdecs and mdec timing in the options.. The game crashes when the full motion mdecs play.. This way there is no mdecs but the game doesn't crash.. You can still here the sound though.. You just see a weird screen.. Atleast the realtime conversation scenes still work ok..