VCA

An amplifier whose volume is controlled by CV

Open in the synth with a demo patch Open Modular

What it does

A VCA (voltage-controlled amplifier) is a volume knob turned by a signal rather than a hand. Level sets the base amount and the Gain input adds CV on top: patch an ADSR and you get a note with an envelope, patch an LFO and you get tremolo or slow waves. Level defaults to zero, so a VCA with nothing on its Gain input is silent.

Try this

Run Oscillator through VCA and open its volume with an Envelope control signal.

Ports

in: Audio in
gain: CV on gain
out: Audio out

Parameters

Level

Try this

Drone → VCA, ADSR → Gain, Clock 1 bar → ADSR: the drone starts to breathe in time.
An LFO with the Smooth random shape on Gain with Level at 0.5: the volume drifts slowly and unpredictably.

Other modules

Math Compare Signal Switch Crossfade Audio File Crossover 3D Scope Image Drone Voice Oscillator Noise Clock Divider Chance Random Note Quantize Sequencer Chord LFO ADSR Filter Overdrive Mastering Delay Reverb Chorus Mixer Attenuverter Scope Output Keyboard MIDI In GM Instrument Instrument Audio In Sampler Looper Note → CV CV → Trigger Follower S&H Euclid Macro Compressor EQ Pan Timeline Progression Note Wavetable Complex Oscillator String Formant Additive Supersaw Texture Resonator Drum Turing Machine Déjà Vu Function Logic Bernoulli Burst Slew CV → Note

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