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Introduction

4bitsynth is a MIDI-controlled digital synthesizer that uses the Atmel AVR ATMega48. Inspired by the NES, the sound is 4-bit. The digital output is put through an R-2R resistor ladder to get the analog waveform.

Demos

Listen to ogg/mp3 demos of the synths in action

Square

  • Three duty cycles: 12.5%, 25%, 50%
  • Volume decay (optional looping)
  • Pitch sweep (up/down, optional looping)
  • Standard Pitch bend
  • Fine pitch bend

Triangle

  • One volume (uses up/down counter)
  • Pitch sweep (up/down, optional looping)
  • Standard pitch bend
  • Fine pitch bend

Noise

  • Two modes: 93-bit and 32k (think NES)
  • Volume decay (optional looping)
  • Pitch sweep (up/down, optional looping)
  • Standard pitch bend
  • Fine pitch bend

Contact

magaio at gmail dot com

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