Struct Vca 

pub struct Vca { /* private fields */ }

Exponential VCA modeled after the SSM2164/V2164.

Features exponential CV response (dB/V) with soft saturation at high levels.

Implementations

impl Vca

pub fn new() -> Vca

Create a new VCA.

pub fn set_cv(&mut self, cv: f64)

Set the CV control input.

Exponential response: 0V = unity gain, negative = attenuation. Typical range: -5V (off) to 0V (unity).

pub fn set_cv_normalized(&mut self, cv: f64)

Set gain from a NORMALIZED control voltage, SSM2164-class dB-linear law.

Convention (SSM2164/V2164 datasheet): the control port is dB-linear at -33 mV/dB (≈ -30 dB/V), 0 V = unity gain, attenuating as the control voltage rises — full attenuation a little above +2.6 V (-80 dB, the datasheet’s specified gain range). Here that law is normalized to a unitless control 0..1 spanning that same range:

gain_db = -80 dB × cv (cv = 0 → 0 dB unity, cv = 1 → -80 dB)

This is the CV port that ModulationTarget::VcaCv drives (compiler vca_lowering pass, audit gap G4). Unlike [set_cv] (volts in, device-specific dB/V), this takes the engine’s normalized 0..1 modulation signal directly.

pub fn set_gain(&mut self, gain: f64)

Set gain directly (0.0 - 1.0+).

pub fn gain(&self) -> f64

Get current gain.

pub fn process(&mut self, input: f64) -> f64

Process one sample.

pub fn reset(&mut self)

Reset VCA state.

Trait Implementations

impl Clone for Vca

fn clone(&self) -> Vca

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Vca

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for Vca

fn default() -> Vca

Returns the “default value” for a type.