2) If #1 is possible, is there a way to toggle between RT / MIDI without going into picker?
I though you wanted to keep the Audio and just toggle between them ?
The midi data will be retained by freezing the track you generated. To toggle between RealTrack and midi instrument, the midi is still there so reverting back to the RealTrack from the midi instrument the original notation is retained. This results in the user being able to toggle between the RealTrack and the midi instruments and each will play the same notation.
The user can decide whether to keep the same notation for all instruments, RealTrack or midi or not freeze the track and get new notation (midi data). Changing to another RealTrack plays the original RT sound. Midi patches can be changed.
This is how it works for me if I'm understanding what you're wanting. I can do a quick video if necessary but freezing the track with whatever midi the user wants retains whatever that midi data is at the time the track is frozen.
I'm glad this is working for some of you. I appreciate your thanks.