I had to figure out how to erase automation in cubase mixer console stereo output because I accidently decreased and increased main volume in automation. Resetting the track only erased the inserts or effects not the automation.I went back to the mixer and held mouse left click over the fader slide through the whole track and that fixed it..Another way is to delete the stereo output and load another one and the automation in the mixer is erased for the stereo output only.But you end up having to reassign all the audio tracks to the new stereo output.(time consuming)er, what was the question?
Stereo in and out are somehow in the main screen in cubase so you can reset it or delete it(volume automation from there).Hopefully, it was an hour and a half long opus you were holding the mouse button through.
When you record automation on the Stereo Out bus, it creates a track on the timeline. Expand the Volume track, Right Click and select Select All Events. Hit the Delete key.
Clicking to reveal the automation is something easy to miss but chilli has the spot on answer. I too spent entire running time holding the fader till I realised it.