Specs - Keith McMillen Instruments SoftStep Reference Manual

(6) Expand Port
Used to connect the MIDI Expander to the SoftStep. Just use a mini USB cable to connect the
SoftStep's Expand port to the Expander's EXPAND port.
Note: Only KMI MIDI controllers should be connected to the EXPAND port — other USB MIDI
controllers and USB hubs will not work properly.

2.2.2 Specs

Dimensions & Weight
• Dimensions: 4" x 1.25" x 1.25" (102mm x 32mm x 32mm)
• Weight: 2.5 oz. (71g)