put the lessons together

synth playground.

One sound, two envelopes, one LFO. Play a note, hold it, and let go. Hear the filter and volume change together.

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readyC3 · 130.8 Hz

Filter envelope · cutoff movement

Amp envelope · volume

LFO · repeating movement

CutoffVolumeLFO

Blue attack → amber decay → green sustain → purple release. The example becomes live when you play. Diagonal lines show the filter envelope’s range.

Hold a key with your mouse or touch, then let go. You can also use A W S E D F T G Y H U J K. The Play button holds C3 until you release it. One note at a time.

sound source→filter + filter envelope→amp envelope→output· LFO moves its chosen destination

Sound source

Choose the tone before it reaches the filter.

Filter

Cutoff sets the starting point. Envelope amount sets how far it moves.

Filter envelope

How quickly the cutoff moves out, settles, holds, and returns. Changes apply while you hold a note.

Amp envelope

How quickly volume rises, settles, holds, and fades out. Changes apply while you hold a note.

LFO

Rate = how fast. Amount = how far. Zero amount turns the movement off.

A playable browser synth using the lessons’ simplified SVF and ladder models. Inspired by OP-XY; its exact algorithms and sound will differ. Return to the lessons.