Tone Forge is a free online oscillator and tone generator that runs entirely in your browser. It stacks ten independent oscillators, all tuned to the root note C, and gives each one its own switch, waveform, gain, stereo pan, start time in beats, length in seconds, attack and release. Choose a sine, triangle, sawtooth or square wave, or draw your own single-cycle waveform by hand and the synth turns it into a periodic wave. A ping-pong switch loops the whole arrangement forwards and then mirrored in reverse. Each wave gets simple built-in effects — a room, hall or plate reverb and a subtle, wide or deep chorus — and the whole stack runs through a master chain forked from the songtools.music Signal Dashboard: an 8-band parametric EQ with a draggable response curve, a dynamics compressor and a brickwall limiter. Watch every wave on a draggable timeline, then export the result as a 24-bit WAV, a lossless FLAC or a 320 kbps MP3. Nothing is uploaded; all synthesis and processing happens locally on your device. Part of songtools.music. See the legal disclaimer.
10× oscillator · root c · master chain
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Drag across the pad to draw one cycle of the wave. The shape is turned into a real periodic wave, so it plays clean at every pitch.