Thank you for taking the time to explain that… I finally got the idea. So as the midi track is recording, you can input the CC changes to take place at particular places along the track? The amps have a form of modeling so I would think that the sounds coming from the amp are changed as the playback reaches the change. Not to sound dumb. But, how are these numbers (1-127) defined…is it by the user or is there is there a defined standard somewhere?