SetonixSynth Marsupial Manual

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Marsupial Dual Voltage-Controlled Filter User’s Manual

Updated 03/25/2022

Technical Specifications (Eurorack)

Width: 8hp

Depth: 25mm

Current Draw: 36mA @ +12V; 35mA @ -12V

Hello and thank you for using the Marsupial Dual Voltage-Controlled Filter for Eurorack. We hope you will

find its tones most pleasing!

1. Connecting your Marsupial

Use a typical 10-16-pin Eurorack ribbon power cable to connect the rear header of your Marsupial module

to your Eurorack case's power bus. The -12V (red stripe) side of the ribbon cable must be aligned with the

white silkscreen indicator stripe for proper use. This module is reverse diode protected, but it is still not

recommended that you plug it in backwards to see what happens.

2. Theory of Operation

The Marsupial began life as a smaller filter meant primarily for Stereo use, with an IC at its core (the

AS3350 Dual Filter chip) geared toward this use. As such, it is a very effective Stereo filter over the entire

frequency range in Parallel mode with the B Offset knob set in the center, useful for processing stereo

sounds through simple manipulation of the Global Cutoff and Resonance controls and patching of CV into

Filter A’s controls with nothing patched to Filter B, thus creating normalized control of both filters.

However, upon testing various early prototypes it became apparent that the Marsupial’s true sonic power

and much of its most interesting behavior comes from interaction between the two filters, and to this end

the module’s relatively simple controls are designed to establish interesting relationships between the

cutoff frequency of each. Simple offset of Filter B is a powerful tool to create timbral “movement” by

controlling the sharpness to which harmonics are removed at each of the two filters’ cutoff frequencies,

and then the attenuverters on each CV Input can be used to play with the space between each cutoff.

Interesting and otherworldly sounds can come from overlapping the two filters using nothing more than a

simple envelope or LFO for modulation.

Once the relationship between the two filters has been established via the Offset knob and CV inputs, the

whole configuration can be shifted across the whole frequency spectrum using the Global Cutoff knob, or

1V/Octave Input A with nothing patched into 1V/Octave Input B. This creates easily-controllable complex

filter sounds, especially once multiple outputs are mixed together.

Both filters in the Marsupial contain an enhanced Resonance circuit which allow the filter’s tone to go

from subtle tone-shaping, to powerful sympathetic resonance, to a clean sine-wave which tracks

1V/Octave signal well over approximately 5 octaves when self-resonating. Self-resonance will mix with

any audio input.

3. Summary of Functions

Audio goes into the Marsupial via the two jacks labeled “A-Audio In-B”. If audio is patched to the A input, it

will be normalized to the B input. Each audio input is routed to a discrete single-supply JFET buffer

pre-filter. The buffers will introduce a subtle saturation/clipping sound to the audio inputs once the signal

level reaches approx. 8Vp-p, providing some nice added harmonic material for the filters when driven. If a

Produkt Specifikationer

Mærke:	SetonixSynth
Kategori:	Ikke kategoriseret
Model:	Marsupial

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