## Description

This is a digital simulation of the Moog ladder filter in a low-pass configuration with 4-poles (roll-off: 24dB/octave).

## Parameters

### V/oct

 Control Type Has Sub-chain? Sub-chain Parameters Fader Scale Pitch yes transpose (-3600¢ to 3600¢) logarithmic ratio

This parameter is used to transpose the base frequency up or down according to an incoming modulation value that is V/oct calibrated (typically one of the inputs from the ABCD matrix). In other words,

${\displaystyle {\text{f}}={\text{f0}}*2^{\frac {x}{1200}}}$

where ${\displaystyle x}$ is the value of this parameter (which is in cents). For example, if the base frequency (f0) is equal to 55Hz and this V/oct parameter is set to 2400¢, then the resulting frequency will be 220Hz (i.e. 2400¢ = 2 octaves which is 4x).

### f0

 Control Type Has Sub-chain? Sub-chain Parameters Fader Scale Gain/Bias yes gain (-10,000 to 10,000) bias (5 octaves above and below 440Hz) frequency in Hertz

This parameter sets the fundamental frequency that is subsequently transposed by the V/oct parameter. Modulating this parameter corresponds to (thru-zero) linear FM.

### Q

 Control Type Has Sub-chain? Sub-chain Parameters Fader Scale Gain/Bias yes gain (-10 to 10) bias (0 to 1) linear

This parameter controls the filter's resonance. Resonance is the result of a soft-limited feedback path. This parameter sets the gain on that feedback. The filter will typically self-resonate at values exceeding 0.5 to 0.6.