Read & flash, import & export the MIDI CC config map directly via this website
Connect the MMM device via USB and select "Adafruit Trellis M4" (you may need to reload this site):
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Some MIDI devices can be controlled by subsequently transmitting two standard 7bit CC parameters which are combined to describe a 14bit value. This enables for instance increased resolution when controlling pitch effects. The MMM device supports both 7bit (standard) and 14bit MIDI CC control.
The midi map above contains two fields for each controller. The first "M" field contains the "most significant" controller id for 14bit control which should be set to zero for 7bit standard MIDI CC control. The second "L" field contains the "least significant" controller id for 14bit control or the actual controller id for standard 7bit MIDI CC control.
Example:
M/L: 1 2 sends 14bit values on Midi CC parameters 1 & 2. M/L:0 3 defines 7bit control on Midi CC parameter 3.