Have you got the synth set up as an external instrument? This should be handled for you. But if not, you can solo defeat an audio channel (or any other channel), with Alt-click on solo. It will change from S to D.
Have you got the synth set up as an external instrument? This should be handled for you. But if not, you can solo defeat an audio channel (or any other channel), with Alt-click on solo. It will change from S to D.