Made by a Japanese person using the name air_variable. He’s using an XBee for wireless serial communication. This just gives you a serial line, which can be interfaced over USB. This is not real MIDI, but you can use a serial to MIDI converter for this. For example, BlipBox MIDI serial or Spikenzie Labs Serial MIDI. Or why not Korg’s (!) PCIF-NT driver, as suggested in Lady Ada’s MIDI Zigbee tutorial. There are even more serial MIDI converters if you use Google.
Source: air_variable posts tagged monotribe (Japanese)