All 18 recording channels can now be selected to be whatever you want on the QuDrive now, but the default setting is that 17 & 18 record L+R (which then plays back through ST1).
You need to go to “Setup” > “Output Patch” . “USB Audio” and change it there to what you need.
Does the output patching for the Qu Drive get saved with the scene, or is this going to be another one of those things I have to double check every time?