A simple polyphonic synthesizer (live demo here: [!]), using analog-style subtractive synthesis as the basis and taking basic architectural inspiration from classic Roland analog synthesizers, such as the Juno-60 and the SH-101. Three waveforms are combined (square, sawtooth and triangle), mixed and filtered together for a big, fat sound. They are slightly detuned from one another (101%, 99% and 100% of the designated frequency, respectively) for a slightly warbling, chorus effect-like sound. This lends a more unstable, but more musical tone.

JavaScript and React.js are the core of this project. I wanted to use the React.js library because it seemed to be a natural choice since there were a lot of moving parts and lot of changing parameters. I utilized the MDN Web Audio API to provide the core of the NH-101's sound generation and modulation. jQuery handles key listeners for keyDown & keyUp actions, triggering note on and off.

• A clean, clear design
• A single oscillator sound-source, with individual gain amounts for Square, Triange and Sawtooth waves
• The ability to play the instrument using the computer keyboard over a single octave (accidental keys too)
• A resonant lowpass filter
• A amplifier/gain control
• A triangle-wave LFO, linkable to both the filter cutoff and the amplifier gain

• Build out keyboard
• Single sound-source

• Keyboard interface
• Master Volume slider

• Gain sliders for Tri, Saw, & Square

• Attach basic lowpass filter

• CSS
• Better design

• Sub-oscillator
• Arpeggiator
• ADSR envelope
• LFO
• Resonance on filter