Its a stand alone device with a programmable microcontroller based on Arduino, that converts midi messages to triggers.
It has 12 triggers outputs that can drive solenoids, dc motors or electromagnets and was conceived to create an electro acoustic instruments controlled via MIDI messages.
It has a standard midi input, and a midi-thru to chain several of percussion actuators. Each output has a transistor that can deliver up-to 1 amp, so you can use Solenoids up-to 24v.
The microcontroller is powered with a standard wall-adapter (not included), and it requires a second power supply (like a cheap switching power supply, not included) to deliver more current to thru the transistor drivers. It’s a simple interface to create midi controlled electro-acoustic drum machines.
![](https://i.ytimg.com/vi/nrZlQmowolU/maxresdefault.jpg)