Skip to content
blzr docs

Build: VCA

A basic voltage-controlled amplifier built from a gain node and a constant source. The const node sets the base level, and the amp node scales the signal. This is the simplest module in blzr and the first one built in the series.

Step 1: Add a gain node

Section titled “Step 1: Add a gain node”

The amp node controls signal amplitude — it multiplies whatever comes in by its gain value.

Nodes added: vca-amp

Step 2: Add a constant source

Section titled “Step 2: Add a constant source”

The const node outputs a steady value. We connect it to the amp’s gain parameter to set the volume level.

Nodes added: vca-const

Connections: 1 new

Step 3: Group into a module

Section titled “Step 3: Group into a module”

Select both nodes and press g to group them. Expose audio-in and audio-out as ports, and the const offset as the Level parameter.

What you just built

Section titled “What you just built”

A reusable VCA module with 1 exposed parameter and 2 exposed ports.

Select it in the Module Library (SPC m) to add one to any patch.

Next steps

Section titled “Next steps”