I tried this method, but it doesn't work if choose "Render using source: region render matrix via master", I still get stereo tracks instead of mono (if I use "Render using source: region render matrix" (without "via master") it works as described)
I think this is by design and not a bug, but there's a way to force render some tracks to mono via the master?
Quote:
Originally Posted by schwa
If you want all of the stems to render as stereo (or however many channels) but the one vsti track to render as mono, you could do this:
- Create a project region spanning the length of the project.
- Open the region render matrix.
- Set the project-length region to render all tracks.
- Right-click the one vsti track and choose "render (force mono) this track for this region".
- Render using source: region render matrix.

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