Question

When adding a New Keyboard there is a section under 'Receive From' called Filter that has check-boxes: Aftertouch, Program Change, Pitch Bend and Controllers.  When checked I am unable to map my Arturia Keylab keyboard. Un-checked I am able to map my Keylab.

What is the function of these check-boxes?

Answer 1

When checked, those filters will filter out the MIDI information for the respective box.  For example, if you check the box for "Aftertouch," all Aftertouch MIDI data will be filtered and will not be sent.  Those options are there to filter out MIDI data that you do NOT want to be sent.  If left unchecked, the MIDI data will be transmitted.