When recording for video collab,I want to use my amp.Often I need to send file of my solo without backing track.I have a MacBook,Reaper and separate video recorder.Is the easiest way to provide all 3 files( vid,solo with backtrack,solo without backtrack ) to film solo while listening on headphones to backing track,ie not filming audio of backing track then in iMovie trying to add backing track as separate audio.Hope this makes