I have been thinking on audio projects, and I have been looking around what is possible to do.

• Adafruit Music Maker FeatherWing
  • It is a audio player, and midi player. It can be created to do a keyboard, or to play some sounds. It is very handy to output some audio
• PUCA DSP
  • It uses the WM8978 codec. Can be used for Digital signal processing.
• External I2S module - stereo CODEC WM8731
• Teensy with Audio board
• WVR Audio Development Board
  • It is a sample player
  • It has a RAM and a I2S DAC
• AI Thinker A1S
  • It is a ESP32 SOC with a audio codec
  • It is obsolete
• Daisy Even compatible with Faust. It is STM32 with PCM3060