JLCooper MCS3 SP USB for OSX - Manual (Page 18)

MIDI Tab
An MCS3 SP can be made to appear as a MIDI device to MIDI applications. Any MCS3
SP control can be programmed to send and respond to a MIDI message.
There are three radio buttons for choosing the type of MIDI message to assign.
None No MIDI message for the selected control. If some other type of
action has already been assigned, the None button will be selected.
Clicking on the None button will delete the currently assigned
action.
Native MIDI Native MIDI actions send and respond to the same messages as
the MIDI version of the MCS3. You would typically use this setting
with an application which directly supports the MCS3 SP protocol. It
could also be used with an application that has a MIDI “Learn”
feature.
For convenience, choosing Set all Controls to Native MIDI in the
Actions menu will assign Native MIDI actions to all of the MCS3
SP controls on all layers in the current keyset.
Custom MIDI Custom MIDI actions send and respond to user defined MIDI
messages.
MCS3 SP USB Software
16