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