MIDI-controlled 8-bit digital synthesizer & lo-fi audio sampler

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Introduction to the “deMIDulator”: my PIC-based MIDI-controlled 8-bit digital synthesizer and audio sampler. That’s a lot of hyphens!

Device generates several different sounds based on incoming MIDI Note On/Off, Pitch Wheel and Control Change messages. Default waveforms are Sine and Square. An audio sampling function is available to record custom waveform samples that can then be played-back similarly to Sine and Square waveforms (think Impulse Tracker or Scream Tracker or any other tracker from 1997). Audio input is switchable between on-board microphone and external 4-conductor headset jack.

Current Features:

* Simple interface

* Sine, Square and audio Sample playback waveforms

* Audio input switchable between on-board Mic and headset jack

* Up to 4 seconds of recorded audio @ 8bit x 3.937kHz

* Switchable mono / 4-note polyphony for all waveforms

* Pitch Wheel (glitch) support

* Sustain support

* Program Change support for switching waveform modes

* All MIDI notes implemented

* Volume and Output Filter Cutoff controls

* Powerful 150mW headphone amplifier can drive headphones or external speaker

* 4-conductor audio jack for use with iPhone compatible headsets (earbuds w/mic)

* Powered by 3 x AAA batteries, DC power jack or ICSP header

* Final firmware written completely in Assembly

* ICSP header for reprogramming PIC

* PCB includes unpopulated MIDI output jack for fun

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