The Threeler is the name of a third-order VCF. Its main documentation is in this file:  doc link

Below are some sound clips.

The Threeler VCF in Mode 1 (third order lowpass). This clip illustrates some of the vocal and nonlinear distortion effects that the module can produce. The signal path used is a straightforward VCO-VCA-VCF one.

Several short clips demonstrating the Threeler in mode 2. Modulation of frequency and resonance along with operation above the oscillation threshold provide a wide variety of timbres including some interesting vocal sonorities.

Here is a demo of Threeler's mode 3. Several waveforms are sent sequentially to the filter via a wave scanner. The filter FM and Q are modulated by an AD+AR envelope generator.

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