An attenuator is a VCA without voltage control — a fixed-gain module used to scale CV and audio signals

An attenuator reduces a signal’s level by a fixed ratio set with a knob or slider — it is a VCA where the control amount is manual rather than voltage-driven. Its most common use in patching is scaling envelope modulation depth: if a modulation destination responds too dramatically to a full-range envelope CV, running the envelope through an attenuator before the destination limits the swing to a musically useful range. Because any CV or audio signal can be attenuated, attenuators appear throughout a patch wherever a signal is ‘too much’ — the article stresses there are too many uses to list, but taming envelope modulation depth is the canonical one.

Examples

Envelope → attenuator (knob at 50%) → filter cutoff CV. The filter’s cutoff sweeps half as far as it would with the unattenuated envelope, producing a subtler timbral change.

Assessment

When would you choose an attenuator over simply turning down the envelope depth knob on the envelope generator itself? Give a scenario where they are not equivalent.