Straightforward Project and Wonderful Toy
For T. Chordstrum
Just put together my kit last night. Maybe a two hour build, including my embarrassing mistakes in Teensy programming. (Yes, when installing Teensyduino on a Raspberry Pi, the udev rules are important.)
I used a Teensy 3.2 that I already had put full length pins on, so it stands a bit proud from the socket, but that probably made it a little easier to attach the two non-socket connectors underneath.
The MIDI output works like a charm; the synthesizer is a lot of fun if a little noisy. If I use it for any kind of performance it'll be through a processing chain, so that's not a huge concern. I look forward to digging into the source code and playing further.
All in all, a wonderful musical toy.