Synthux AcademyDIY platforms
Small Daisy Seed prototyping board with a few knobs, switches and jacks
Simple Fix is a compact PCB from Synthux Academy for quick synth and effect sketches. The kit pairs the Fix board with a Daisy Seed, and the product page says the board can also take a Teensy or an Arduino Nano. The Daisy kit includes two mono jacks, four 10K trimmers and two switches, and the board leaves room to add more controls.
The Fix is meant as a starting point, so firmware is whatever sketch or program you load onto the Seed. Synthux's own examples are DaisyDuino (Arduino IDE) sketches; community firmware is compiled with libDaisy or Arduino and flashed with the Daisy Web Programmer or dfu-util after putting the Seed in DFU mode (hold BOOT, tap RESET). Because the control layout is small, the same firmware sometimes also runs on the Touch 2 and Simple Designer boards, but check the pin mapping first.
Generative noise synthesizer and audio destruction processor for the Simple Fix: 11 DSP noise patches stepped with the toggle switch, three knobs for density, register and input mangling.
Synthux's official DaisyDuino example instruments for the Simple Fix board: arpeggiator, drum machine, looper, multivoice arpeggiator and drone, and string, string delay and string reverb.