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Music & Learning Tools

Simple Synthesizer

Shape a playable oscillator keyboard with live waveform, filter and envelope controls.

Your content stays on your device Free, with no account
Simple SynthesizerLocal sound & practice

Sound & practice settings

Root octave
Oscillator

Ready. Sound or microphone access starts only from your action.

Behavior, limits & privacy

Sine/triangle/sawtooth/square oscillator, low-pass cutoff and resonance, attack/release and master signal level. Waveform, filter and level affect sounding voices; attack applies to new notes and release to subsequent note releases. This is a simple monophonic-per-key polyphonic synth, not a plugin host or acoustic emulation.

All processing stays in this browser. Hidden documents, Reset, workflow switching and page exit stop audio and microphone access. No uploads or stored performance/history. Optional JSON reports download only when chosen.

Play & explore

—Status
—Observation
—Details

Computer keys A W S E D F T G Y H U J K play the first octave while this keyboard has focus. Space/Enter plays the focused note. Tab leaves normally.

Press or hold the keys to play. Start with low device volume. Audio starts only from your action.

A FEW SIMPLE STEPS

How to use Simple Synthesizer

  1. Choose the visible settings. Start at a low device volume for playback; the tuner requires explicit microphone permission.
  2. Use the controls next to the instrument, beat or live tuning preview.
  3. Sine/triangle/sawtooth/square oscillator, low-pass cutoff and resonance, attack/release and master signal level. Waveform, filter and level affect sounding voices; attack applies to new notes and release to subsequent note releases. This is a simple monophonic-per-key polyphonic synth, not a plugin host or acoustic emulation.
  4. Stop or Reset when finished. Reports are optional; hiding, switching or leaving releases local audio and microphone access.
PRIVATE BY DESIGN

Why use this tool?

Instruments and practice run locally using self-hosted code and synthesized sound. Only the tuner requests microphone audio, after Start; its samples are analysed locally without recording, monitoring or upload.

Tool inputs stay in your browser. Only your theme preference is saved on this device.

A few things worth knowing

How does this tool work?

Sine/triangle/sawtooth/square oscillator, low-pass cutoff and resonance, attack/release and master signal level. Waveform, filter and level affect sounding voices; attack applies to new notes and release to subsequent note releases. This is a simple monophonic-per-key polyphonic synth, not a plugin host or acoustic emulation.

Does it upload audio or store practice history?

No. Generated sounds, local observations and practice results remain in the active browser page. Only the tuner requests microphone permission, and no microphone samples are recorded or uploaded.

What happens on Stop, hidden tab or switching?

Playback, scheduled notes, microphone tracks and analysis are stopped. Reset and workspace switching release working state. A downloaded JSON report remains under your control outside the application.

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