Two passive vactrol-based low-pass gates. Works like a rudimentary VCA with some level-dependent filtering on the output signal at varying amounts dependent on the ‘Tone' setting. Creates ‘organic' feeling sounds especially on short, plucky and percussive sounds. Or can be used to modulate another CV in the same way as a VCA, albeit less responsively and non-linear.

With the ‘Tone' switch in top position, the sound has some filtering, but higher control voltages can open the filter near-completely. The bottom position is the dullest, with the most low-pass filtering. Leaving the switch in the centre position gives next-to no filtering although the signal is still somewhat coloured by the circuit.

One quirk of the module is the relatively sluggish response time, especially on the down-slope, this adds to the plucky sound and also gives a natural ‘release' to the CV, meaning it works very nicely by simply feeding a gate signal into the CV input without the need for an envelope. This release is dependent again on the tone setting, so the darker setting has a shorter release compared to the bright setting which has a very long release.

Since version 2.1 the top CV and and Signal inputs are normalized to the bottom inputs.