Hi slackyhacky,

Thanks for visiting Apple Support Communities.

I believe this is the option you're looking for, from the Logic Pro 9 User Manual:

http://documentation.apple.com/en/logicpro/usermanual/index.html#chapter=14%26se ction=0

Filtering MIDI Events When Recording

The MIDI protocol can contain a broad range of MIDI messages, beyond note-on and note-off messages. These include controller information such as pitch bend, modulation, and aftertouch (pressure) commands.

There may be situations where you don’t want to record all information being sent by your MIDI controllers. In this case, you can use several “MIDI filters” that allow you to define what event types will be accepted or rejected at the sequencer input.

To filter incoming MIDI events

 

1. Open the MIDI project settings by doing one of the following:
   • Choose File > Project Settings > MIDI.
   • Click the Settings button in the Arrange toolbar, and choose MIDI from the pop-up menu.
     
     
2. Click the Input Filter tab.
   
3. Select the checkboxes that correspond to the MIDI event types you would like to filter at the Logic Pro sequencer input.

All the best,

Jeremy