I've been using HDSPe AES with Cubase 5 on Windows 7 since 2010. With Direct Monitoring on, I was able to "control" Total Mix via Cubase. Turning on/off channel monitoring on Cubase will mute/unmute the corresponding HW input on TotalMix and solo/mute on Cubase will do the same.

Since updating to Windows 10 & Cubase 10, I'm no longer able to do this. I did both software upgrades (plus all driver updates) at once, so I'm unable to determine where the problem is.

I do notice however, this feature starts working again intermittently, without any settings changes made, sometimes even midway through a session.

Here's a video of this feature at work, for some context:
https://drive.google.com/file/d/1MeSJCl … sp=sharing

This could possibly be a really simple fix, I might just be missing a setting somewhere. Any help is much appreciated.