Enabling a MIDI Control Surface in Pro Tools5 If your MIDI control surface has more than eight channel strips, or if you are using multiple devices of the same type in series, choose the appropriate number of channel strips from the pop-up menu under #Ch’s.
You can configure additional MIDI control surfaces (up to a total of four) by repeating the above steps. Make sure that none of the control surfaces are assigned to the same MIDI source and destination ports or channels in the Pro Tools Peripherals dialog.