This video, via Pocket Trax, takes a look at creating custom electronic music gear using the Electrosmith Daisy Pod.

The Daisy Pod is a compact, USB-powered development board for the open-source Daisy Seed audio platform. No soldering and no breadboard needed. It has 2 knobs, 2 buttons, a clickable encoder, stereo line in/out, TRS MIDI in, and a headphone out.

You can program it with C++/Arduino or Pure Data/Max Gen, or patch visually in PlugData.

Set the Daisy Audio site for details.