Gecho Loopsynth, a DYI Pocket Subtractive Synth, based on STM32F4 Cortex-M4 MCU is a pocket-sized musical instrument, active relaxation device, open-source, DYI platform for experiments with sound and music. It features DSP processor board with implementation of subtractive synthesis and few other modes of operation. Get it here: http://kck.st/2hW7lCd
