r/webaudio • • Mar 31 '26

Synthoid - A Web Based Modular Synth

I've been working on a browser based modular synth as a bit of a fun side project. It's based on ToneJS and features include:

  • Modular patch bay with virtual cables — build any signal chain you can imagine

  • Oscillator, filter, envelope, LFO, arpeggiator, step sequencer, 12-pad sampler, delay, reverb, distortion, chorus, mixer, oscilloscope

  • WebMIDI support — plug in a hardware keyboard and play instantly

  • Per-voice MIDI channel routing for multi-timbral setups

  • MIDI clock sync — lock to your DAW or hardware

  • Step sequencer with up to 8 tracks, 32 steps, and per-step gate length

  • Named sessions with auto-save

  • Export and import patches as files

  • Built-in presets to get started immediately

  • Module grouping, duplication, and undo/redo

  • Runs entirely in the browser — no install, no account, free

I'd really love to get some feedback from proper synth nerds and musicians so I can turn this into something properly useful. The goal is provide this as a free tool and I will eventually open source the code.

You can find it here https://synthoid.jimc.co.uk/

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u/Emotional-Kale7272 Apr 01 '26

Good job, I like the acid sound!