Download MobilePre USB driver by M-Audio at 440Software
MIDI interface which is compatible with 2010 macbook pro - Sound Design Stack Exchange
Midiman Midisport 4x4 USB MIDI Interface With USB Cable - 612391300616
Download Midisport 2x2 Driver by M-Audio at 440Software
M-Audio Midisort 4x4 4 Port Midi Interface | PSSL ProSound and Stage Lighting
M-audio MIDISPORT 4X4 USB - M-AUDIO MIDISport 4x4 USB Midi-Interface 4 INs, 4 OUTs, for PC ( Win98SE/2000/XP) and Mac (OMS)
m-audio midisport - which are compatible with os9?
Mike Kasprzak 🦖 on Twitter: "The MIDISPORT 4x4 is excellent, built like a tank (also no longer available for sale), but the lack of a Thru toggle means you can't jam on