This project was begun as a darivative of much simpler projects.

The goal is a psudo polyphonic analog and/or multi-timbral synthesizer that is digitally controlled.

Utilizing components from the following manufacturers:

• Espressif
  • ESP32 processors
• Sound Semiconductor, FatKeys™
  • VCO, VCF, VCA
• Adafruit
  • D/A Converter modules, I/O Expanders
• HiLetgo
  • 2.0 ADK Mini USB Host Shield
• Waveshare
  • Display module

The core of the system is an ESP-WROOM-32 ESP32 ESP-32S development board with a USB development shield to interface a midi keyboard. Any midi controller will work. I am using an inexpensive Samson Graphite 49 on the serial MIDI and a Novation LaunchControl XL on the USB MIDI. I intend to add bluetooth MIDI input as well.

The design is for 8 simultanous notes whether they be all of the same effect or split into as many as four voice pairs with unique sound each.

There is a second serial MIDI port for sequencer input. I am currently usinc Logic Pro on a Macbook Air M1.

This project has been on going for over two years now and will likely be a few more years of effort.

I have full schematics included as well as some of the experimental work I have done. This is an unconventional modular design so as to maintain complete digital control.

The tools used are:

• KiCad
• Visual SlickEdit IDE - I have used this for over 20 years and have tried others but found them either missing features or a colossal amount of plugins to figure out.
• Arduino-cli
• ESP32 version 3.1.1 "arduino-cli core install esp32:[email protected]"
• Gnu make for Windows (could be used in Linux as well)
• Espressif frameworks tools to upload utilizing OTA libraries.
• SimplySerial - The best serial terminal software I have seen for this application debugging.
  Thanks Edward Wright (fasteddy516). <<<<<<< HEAD

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