Having assigned my chosen Program Changes in GForce Software’s impOSCar2’s Browser, how do I access these in Cubase so I can make on the fly changes in Cubase 12?
Refer to the impOSCar manual and check if it responds to MIDI Program Change commands. If so, you can add a CC lane in the Key Editor for Program Change.
You can also change the program/bank via the inspector:
Use the CC Lane option if you wish to automate patch changes on playback.