This workshop will explore building digital musical instruments using Bela, an embedded platform for audio and sensor processing. Bela features include ultra-low (< 1ms) latency from action to sound, analog and digital I/O sampled automatically at audio rates, a convenient browser-based IDE including an in-browser oscilloscope, and support for programming in C/C++, Pd and SuperCollider. Following an introduction to Bela, participants will extend and modify simple musical instruments based on contact microphones and waveguide string models, focusing on the subtle details of instrument craft. Electronic parts and a variety of physical materials will be available to incorporate into the instruments.