it features 2 sine wave oscillators and a decay envelope to control their amplitudes. perfect for growling percussion and plucky melodies.
features:
fm: the amount of fm modulation of the carrier. the associated cv input is an offset to the slider.
khz: the base frequency of the carrier oscillator. the associated cv input is an offset to the pot.
ratio: the ratio of modulator frequency to carrier frequency.
op1: the main output.
trig: a rising edge triggers the built in decay envelope. this envelope modulates the amplitude of the carrier, as well as the modulator (at a slightly faster rate) incoming triggers are ignored when the envelope is active, thus allowing for frequency division based on the decay slider.
specifications:
+12v: 45ma
-12v: -5ma
while the look of 2opfm has changed, this demo video from version 1 modules still is a great intro to its features. the main addition here is voltage control of the internal envelope :)
notes:
1: -12v is unmarked on the power header on some runs (who would do such a thing?!) the red stripe on your power cable should go down. -12v is down.
2: the khz input does not have a 1v/oct response, but more like a 0.5v/oct response. this is on purpose, to allow for the big tasty range of timbres that makes 2opfm a very flexible tonal source. if you want it to play in tune, you can feed a 1v/oct signal through an attenuator, set to approximately 50%, and tune it up.
