Draw.Audio is a free web-based music sequencer and synthesizer that lets you create patterns by drawing on a 32x32 grid and hear them play back in real time. It runs entirely in the browser using the Web Audio API and requires no downloads or installations.
What is Draw.Audio?
Draw.Audio is a browser-based music production tool that combines a step sequencer, synthesizer, and effects processor into one interactive interface. It takes input as drawn notes on a grid and outputs audio playback through your device's speakers. The tool supports multiple synth engines including waveform synthesis (sine, saw, triangle, square, pulse), FM synthesis (6-operator), and wavetable synthesis. It is developed by an independent creator and offered for free at draw.audio.
Key Features
- Grid sequencer – Draw notes on a 32x32 grid with adjustable density, pitch, and velocity; playback can be forward, backward, or bounce; BPM and swing (50%) control timing.
- Multiple synth engines – Choose from basic waveforms, FM synthesis with six operators and adjustable algorithms, or wavetable mode with analog morph sweep; each synth has independent amp/pitch envelopes, sub oscillator, noise generator, unison (up to 8 voices), and drift.
- Effects chain – Per-track effects include reverb (mix up to 40%, decay 100%), delay (six modes: ping-pong, mono, stereo, slapback, reverse, pitch shift; with sync and feedback up to 30%), distortion (nine types: soft clip, hard clip, wavefold, bitcrush, rectifier, exponential, Chebyshev, downsample, crossover; with drive up to 0 dB and tone control), stereo spread (width up to 70%), chorus (rate 0.5 Hz, depth 50%, mix 20%), and ring modulation (mix 0%, freq 200 Hz).
- Filter and EQ – Lowpass/highpass filters with resonance up to 74% and filter envelope; parametric EQ with up to 7 bands (highpass/lowshelf/peak/notch/highshelf/lowpass), presets (vocal, warm, bright, phone, v-shape, bass, de-mud, de-ess).
- Modulation – Two LFOs per track with sync to grid or free rate (0.1 Hz to 16 bars), depth control, and anchor; automation mode allows drawing parameter changes directly on the grid.
- Drum tracks – Dedicated drum row with pitch (-12 to +12 semitones) and volume control; includes a built-in drum machine (TR-909 emulation) with sidechain (depth 70%, attack 0.5 ms, ratio 12:1, release 100 ms).
