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Synthesizer
A playable synth with two oscillators, filter, envelopes, LFO and effects, with MIDI keyboard support.
Free tools that run in your browser. Nothing you type, open or create is uploaded to NerdBible or anyone else.
Note
Oscillator 1
Oscillator 2
Filter
Filter envelope
Amp envelope
LFO
Delay
Reverb
Turn a knob by dragging up or down (hold Shift for fine steps), or click it and use the arrow keys or the mouse wheel; double-click puts it back to its starting value. Computer keyboard: Z to M (with S, D, G, H and J as the black keys) plays the lower octave and Q to P (with the numbers as the black keys) the one above. Knobs and buttons do not take the keyboard away: change a setting and keep playing. The patch link holds every setting after the # in the address, so it never reaches a server. Turn the volume down before trying high resonance.
How to use it
- Pick a preset, then play the keys on screen, your computer keyboard or a MIDI keyboard after pressing Connect MIDI keyboard.
- Shape the sound: the two oscillators make the raw tone, the filter darkens or thins it, the envelopes shape how each note starts and fades, and the LFO adds movement.
- Press Copy patch link to copy a link that opens the synth with your exact settings, to keep or share.
Questions
Can I play it with a MIDI keyboard?
Yes, in Chrome, Edge or Opera on a computer. Connect the keyboard, press Connect MIDI keyboard and allow MIDI access. Velocity sets the loudness, the pitch bend wheel bends by up to two semitones, the mod wheel sets the LFO depth and a sustain pedal holds notes. Next time it connects by itself.
What is subtractive synthesis?
Start with a bright, buzzy waveform such as a saw or square wave, then take away (subtract) frequencies with a filter. Moving the filter with an envelope or LFO is what gives classic synth sounds their character.
Can I record what I play?
Not on this page. The sound is made live by your browser and is not recorded or stored. To record, use a screen or audio recorder on your device.
Why does it crackle when I play many notes?
Each note runs its own oscillators and filter, so big chords with long releases and reverb need more processing. Shorten the release, or close other busy tabs.