Filters
A low-pass filter emulating a 4-pole transistor ladder.
It attenuate around 24dB/octave.
It tries to recreate the classic warm sound of the original analog transistor-ladder filter.
CUTOFF
With the cutoff attenuator turned fully clockwise the cutoff CV input will modulate with 1V/octave.
DRIVE
The drive control the input gain. Lower gain will make the filter give a more linear response, it can also increase the ratio of resonant peak versus passband gain. At higher gains the non-linear response of the filter can start to distort the passband also, which can lead to some compelling sounds.
RESONANCE
When input is unplugged, go silent or drive is turned fully counter-clockwise at very high resonance setting it can self-oscillate.
The self resonance is a sine wave, not programmed that way, but just appears as a consequence of how the way the filter replicates the analog circuit.
PASSBAND GAIN COMPENSATION
Right-clicking on the module and bringing up the context menu, will give the option to disable or reduce the passband gain compensation. Per default its enabled. When turning up resonance in the analog circuit the passband is not really affected due to the feedback is instant. However this is not the case for typical digital filters, feedback will be delayed, which when turning up resonance will decrease the power of the passband. The compensation when enabled will prevent that decrease to be too large an effect. The reason it can be reduced or disabled is if passband is not too important, and you are really more interested in the resonance. But alternatively you can also turn down the drive, which will also increase the resonance power relative to the passband, but of-course will make the filter give a more linear response.
The Dirt module has been removed from the plugin.