Here are some design goals for the audio part:

• Discrecete audio path for each string to allow for independent audio manipulation.
• Audio processing happens within the guitar, not on an external computer.
• Latency under 5 milliseconds.
• low power consumption to allow for battery operation.

After some some research I narrowed my options down to a Bela mulltichannel cape on a beaglebone or a Teensy based platform. I went for the Teensy, because of the lower power consumtion and the much lower price.

The pickup is harvested from a standard Roland GK3-Devided-Pickup I had laying around. Those micro-humbuckers are kinda neat, but the outputlevel is very low. Thats why it has to be very close to the strings and the only position where the strings dont rattle aginst the pickup is next to the bridge.

I also had to make the preamp (which I put on top of the codec-board printed by OSH-Park) fairly high gain. This results in some unwanted noise when playing the guitar through a distortion pedal. Making a better pickup on my list, but I'm happy that otherwise this configuration works quite well.