The ‘mmT’ is an optional 3HP expander which connects directly to the ‘expand’ socket on the rear of the mmMidi using supplied cable. It maps
the third configured MIDI channel key presses to corresponding trigger/gate outputs as shown on the mmT front panel.
It’s useful for controlling drum modules and in particular the ALM Squid Salmple.

https://busycircuits.com/alm023/

• 30 mA +12V
• 0 mA -12V
• ? mA 5V
• 38 mm deep