The 2HP TRS-A Midi expander is a small alternative to the regular Midi-IO Expander. It adds a Midi input and output port to the NerdSEQ. A 3rd port can be set to be either a 2nd output or a thru port. It has all the features of the regular Midi expander except for a missing gamepad port. (Note that only one Midi expander can be used with the NerdSEQ).
The Expander has a black PCB frontpanel and comes with 3 adapter cables TRS-A > 5 pin DIN Midi. Additionally a TRS-A to TRS-B adapter can be purchased as well so it works also with non-standard TRS-B gear.