Phil et al.- I think this is the thread over at Avid that you're referencing:
http://duc.avid.com/showthread.php?t=297502&highlight=phase+plexiHis results sound the same as mine. Weird sound after a bit of sustain. I noticed it in the plexi patch v.1, but it's even more present in v.2. I don't use the noise gate, and find it present regardless of where the speaker break-up is. Switching to the G20 cabinet makes it worse. I also don't use the noise gate, as I stated above.
Thoughts?
m