The Macman is a MIDI Interface with 1 MIDI In and 3 MIDI Outs and it's Geo port compatible.

Extended information

1 MIDI In/ 3 MIDI Outs.
MIDI In, MIDI Out and Power Indicator LED's.
Serial Port Switch allows you to activate or bypass the Macman.
No external power supply needed. Powered directly from the Mac or can be externally powered for use with 500 series Power Books.
Geo Port compatible.
Serial Cable included! Rugged and attractive steel case.

Technical specifications