The MRG FILTRONE is a versatile voltage controlled low pass filter.

The resonance can be increased up to loud self-oscillation, and the module features 1V/O cutoff tracking.

Apart from the usual controls for manual and CV-controlled cutoff and resonance, offers two special features: SLOPE switch and TONE control.

1. SLOPE Switch

The big rocker switch under the cutoff allows the filter to change its slope from 18dB to 24dB.

2. TONE Control

This is a defining feature of the module, and an original one to the best of my knowledge.

In 24dB mode, the tone control blends the output of the second stage (12dB slope) and the output of the fourth stage (24dB slope).

In 18dB mode, the tone control blends the output of the first stage (6dB slope) with the output of the third stage (18dB slope).

Practically speaking, this allows to maintain the cutoff stable, but gently increasing harmonics.

What does it sound like?

The tone control, that allows to dynamically change the slope of the filter, together with the 1V/O tracked self-oscillation, makes this a filter apt to exploration and can produce many different (and sometimes unexpected) sounds, despite the overall simplicity of the module.

The filter, like all other MRG filters, are rich in low frequencies, and can be setup (with low cutoff, high resonance and short A/R in the CV cutoff) to generate powerful kick-like sound.

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