DESCRIPTION:
dual LFO module that i made during our first RobotSpeak 'modular build' session. i'm using a bog-standard patch on an ms-20 to demonstrate. the circuit was created for our modular build sessions by Cyndustries [ http://www.cyndustries.com/ ], and is _loosely_ based upon the modulation section of the classic Moog Sonic Six.

our module is powered by two 9v batteries and is comprised of two simple triangle/square oscillators with frequency range from sub-audio to midrange-audio which are mixed to a single output. there is a master frequency control [top] independent frequency control [middle pair] and mix [bottom]. toggle switches allow selection of triangle or square waveforms. the resulting module can be used to create 'complex' vibratos, rhythmic loops, quasi-predictable voltage patterns and even audio tones.

in this demonstration, i start by using the ms-20's LFO to demonstrate 'traditional' frequency modulation, then i deliberately break that patch and replace it with the 'sonic six' LFO. as can be seen from the knob settings, the ms-20 is doing nothing but producing a sustained tone for the LFO to modulate.