Chirper

a semi-modular arrangement of two oscillators and one filter

• 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.

http://www.bugbrand.co.uk/index.php?main_page=product_info&cPath=1&products_id=128&zenid=8a464f070682bf62a1f7f30305591c28