Ah, we love musical hacks that actually play music. [Mike Baxter] is back again with a new servo electric guitar. This one, called the physical string synthesizer, and has only one string. He’s using two Arduinos to control the unit. One to change the midi file to a note within the string’s limits and the second to actually control the servo. It seems like that could be simplified a little bit, but we’re pretty sure his end goal was to build an instrument quickly, not learn to be a circuit ninja. Last time we saw Mike Baxter, he had built a servo electric guitar that used a keypad for control. You can see a video of the single string one after the break.