I was just about to (try to) make musagi use portaudio v19 so yes, I'm interested by your patch! The 64 bit patch is also interesting, although I don't own a 64 bit machine so it would be better if it worked because I can't test it easily.
After a few months... I took the time to clean it and update it... here is the patch for portaudio v19. there are also a few type changes because I was thinking of porting to 64bit but it doesn't look trivial so I gave up.
This is a problem with my system, without a doubt, but I wonder if anyone has ever come across this, too? Memory is being build up until close to 1Gb and then flushed only to keep rolling through this endlessly. Everytime it comes to the peak memory it stalls for a few seconds then goes again until the next peak within a few more seconds of ramping up memory again and again. I think it is related to the install of Debut Video, probably some weird driver issue of sorts, regardless as to whether debut had ever started or not. Anyway out there having experiences something of that kind?