MATRIXSYNTH: Flight of Harmony QUAD PLAGUEBEARER SN 15/20


Sunday, February 13, 2022

Flight of Harmony QUAD PLAGUEBEARER SN 15/20

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"Not one PlagueBearer, but 4 in a case. This is unit 15 of only 20 made. Version 1.1

As such it has CV for High and Low knobs but not GAIN.

The coolest part of this is that you can feedback from one section to another for some great head ripping effects.


The Plague Bearer is called a filter, but that is just a description of the circuit topology, what it can actually do goes way beyond that. It has been described as a filter, a waveshaper, a mangler, a crusher, and – my favorite – as an “FSU module”.

Calling it a filter may be a bit misleading, but I have no idea what else to call it. It is a filter, but it does more (all at the same time, really) excessive phase shifting, waveforming, ringing, formant generation, and so on. I guess it could be called a waveform modifier or enhancer, but those don’t sound good either. It was named the Plague Bearer for a reason.

All f(h) devices are designed in accordance with how they sound, not to achieve mathematical perfection.

FofH avoided the conventional design approach while designing this circuit, so it’s very problematic to try to describe this filter in the normal terms. The slope is directly tied to the gain of the circuit, making it variable, and the Q is affected by all three filter controls. The setup is actually a combined High- and Low-pass. The corner frequencies are adjusted by the controls and can be overlapped completely, which gives a comb-filtering effect.

Runs on two 9vdc batteries or from included power supply.

Manual is for V2.3 single unit but is applicable to operation."

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