Playback and Recording : MIDI Recording : Enabling Input Devices

Enabling Input Devices
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.
MIDI Control Surfaces
In order to use any MIDI control surfaces (such as Command|8), they must be enabled in the MIDI Input Enable dialog.
MMC
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.
To enable input devices:
1 Choose Setup > MIDI > Input Devices.
2 In the MIDI Input Enable dialog, do the following:
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Select the MIDI devices you want to record. Also, select any device to be used as a control surface.
– and – 
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Deselect any input devices you want to ignore while recording MIDI.
 
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Devices do not need to be selected to receive MIDI data from Pro Tools. For example, a device used exclusively as a sound module does not need to be selected in the MIDI Input Enable dialog.
3 Click OK.