MATRIXSYNTH: Bugbrand Chirper 2020 Red

Monday, December 06, 2021

Bugbrand Chirper 2020 Red



via this auction

Great condition, comes with original box and adaptor! Rare and out of production. Comes housed in 5FW case.

Chirper is a semi-modular arrangement of two oscillators and one filter – a simple setup which belies the rich sonic surprises contained within. It is a direct continuation of , which itself was something of a reaction to my long-evolving works – after 10+ years I was feeling the call for new pastures and, while I enjoyed their deep electronic ecosystems, the lo-fi Weevil circuitry was never suitable for voltage-controlled work. The solution was to tweak ideas I’d been using in the , slightly simplifying some circuits to bring about an instrument with enticing layout and a fine balance of limitation vs. possibility.

Have a look at the Block Diagram above to see how Chirper is put together:
– the two Voltage-Controlled Oscillators are identical, with wide range (approx 0.15Hz to 100kHz) and sweepable from Triangle to Square.
– each oscillator has a Sync input along with Internal (from the other oscillator) and External (1V/Oct) Modulation controls. Things go nutty when the oscillators cross-modulate each other!
– the Voltage-Controlled Filter, with resonance up to self-oscillation and sweepable from Low-pass to High-pass, is fed audio from the 1st Oscillator (via Drive control) and is modulated by the 2nd Oscillator and/or an External (1V/Oct) source.

Of course, there is no internal VCA, so do be prepared for drones! [complimentary modules are in the pipeline] Note also that the 1V/Oct responses of the Oscillators and Filter are only quite accurate – fine for good tracking over a few octaves – and does not feature temperature compensation. Chirper was designed more as a surprise box than a well-pitched synth, but I saw it as a bonus to add simple 1V/Oct response.

4mm banana sockets are used for all I/O other than the Main Output which is 1/4″ Mono Impedance Balanced. The Instruction Sheet has details of interfacing with banana cables."

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