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Latest from MOTU support: I can tell you that we only support mono and stereo (plus side chains) in VST2. This is due to VST2’s limited bus architecture, according to our development team.

Got this from MOTU support:

VST2 bus architecture is fairly limited. While surround support is possible, it's much better with VST3.

The good news is that VST3 support is on our list and may make it into our next update.

Did you find a solution? I've got the same problem. I recently switched from Mac to Windows, so I could be missing something basic. My MAS surround plug-ins show up and can be used, but my VST surround plug-ins don't show up except on a stereo track, or a stereo-to-surround track where they are list...

Same problem here. I find it works sometimes if I've waited a few seconds after recording before hitting Ctrl-Z, but it's not consistent.

That could be true, but it's never been any noticeable latency for me. And, the quadro aux monitor is showing no noticeable latency. And I never experienced any until this week.

Just experienced the same problem. I updated to 9.1 and my projects had noticeable latency. I tracked the problem to an aux track I was using to monitor a satellite VEP. I'm set up so that I send my soft synths to an aux called "VI." I can send this aux to all the audio tracks, but I also ...