Pico Synthesizer

A synthesizer project for the Raspberry Pi Pico 2.

Description

This project aims to create a functional 16-channel polyphonic synthesizer with a maximum of 20 voices running on the Raspberry Pi Pico 2 microcontroller. It includes various features like multiple waveform generation, envelope control, MIDI input processing, and more.

Features

• Polyphonic sound generation
• Multiple waveforms (Sine, Sawtooth, Triangle, Square, Noise)
• ADSR envelope
• MIDI input processing (Note On/Off, Pitch Bend, CC messages)
• PCM drum sample playback
• Reverb effect (Master output)
• Master volume and DC cut filter

Tools

The tools directory contains Python scripts used to generate various data tables and C header files required by the synthesizer:

• wave_table.py: Generates waveform tables and MIDI note-to-frequency increment tables.
• pitch_bend_table_interpolated.py: Generates tables for pitch bend calculations.
• drum_table.py: Processes a WAV file containing drum samples and converts them into C arrays for PCM playback.
• pan_table.py: Generates tables for pan calculations.

License

This project is licensed under the MIT License. See the LICENSE file for more details.

Additionally, the drum samples provided in tools/drum/drum.wav were generated using the MuseScore_General.sf2 soundfont. The license for MuseScore_General.sf2 can be found in tools/drum/MuseScore_General_License.md.