To record from a MIDI device (such as a MIDI keyboard) in Pro Tools, the device must be enabled in the MIDI Input Enable dialog. You can also use this dialog to make sure unwanted notes from certain devices, such as drum machines or arpeggiators, are not recorded.
In order to use any MIDI control surfaces (such as Command|8), they must be enabled in the MIDI Input Enable dialog.
In order for Pro Tools to synchronize to MIDI Machine Control (MMC), the MMC source must be enabled in the MIDI Input Enable dialog. For more information on using MMC with Pro Tools, see
Using MIDI Machine Control.