Deej ~ Hardware Volume Mixer


deej is an open-source hardware volume mixer for Windows and Linux PCs. It lets you use real-life sliders (like a DJ!) to seamlessly control the volumes of different apps (such as your music player, the game you’re playing and your voice chat session) without having to stop what you’re doing.

red deej hardware with five sliders

github.com/omriharel/deej

ML_SynthTools ~ Arduino Synthesizer Library


This library is made to be used for synthesizer projects. It contains modules to create sound, to drive an audio codec and create some audio effects.

This library supports different platforms:

  • ESP32, ESP32S2, ESP32S3
  • ESP8266
  • Seeedstudio XIAO (samd21 – cortex-m0plus)
  • Teensy 4.1 (imxrt1062)
  • Daisy Seed (cortex-m7)
  • Raspberry Pi Pico (rp2040)
  • STM32F407 (cortex-m4)
github.com/marcel-licence/ML_SynthTools

AcidBox ~ DIY Hardware Synthesizer


ESP32 headless acid combo of tb303 + tb303 + tr808 like synths. Filter cutoff, reso, env mod, accent, wavefolder, overdrive within each 303, per-instrument tunings, hi-pass/lo-pass filter and bitcrusher in drums, send to reverb, delay and master compression. All MIDI driven. 44100, 16bit stereo I2S output to the external DAC or 8bit to the built-in DAC. No indication. Uses both cores of ESP32. Cheap ~$10. Consult with midi_config.h to find out and to set up MIDI continuous control messages.

github.com/copych/AcidBox