Thanks Robh. I want to use PTP to play my midi file backing tracks during live performance. My laptop computer is connected to my Yamaha Tyros 2 keyboard. I play the keyboard and sing as the computer plays the midi backing tracks on the same keyboard. I need to have real time control over each of the 16 midi channels (especially for volume). The mixer window in PTP does this very well using a mouse but during live performance I don't have time to control that way. With 16 hardware faders such as dual Korg nanoKontrol2s would have, I can do the "tweeking" as needed. Perhaps some kind of virtual mixer on a pad would allow me to do what I've described also. But I noticed a post somewhere in this forum group that PTP does not have the Mackie standard or any other protocol that would allow hardware midi control surfaces to communicate with PTP. I guess that's my real question.
DVJ