question about the Rolls mo2020 test oscillator

[orangettecoleman]

I know quite a few folks have these, and I've been trying to figure out one thing: what exactly are the possibilities of the voltage control input? are you supposed to plug in a certain pedal or controller to vary the frequency within the limitations of the dial setting? If this is the intended use (as I suspect), can one plug other things in to get interesting results i.e. guitars, recordings, mics etc etc? I'm really unfamiliar with voltage controllers and the possibilities therein but I know i've seen those little pedal noise synths and read that you can plug guitars or other signals into the voltage control input and get some interesting sounds so was wondering if the same could be done with the Rolls mo2020 if I were to get one to replace my big function generator...

[theblackplume]

I have a couple of what looks like the Rolls' cousin, the Tenma 72-490 Oscillator:

http://www.mcmelectronics.com/product/T ... 90-/72-490

They are pretty much the same, i think.

You can't run an audio signal through it as it only takes 1.2 - 5V DC as control input. Putting an normal audio signal through it does nothing.

[orangettecoleman]

thanks for the info. the one you have looks pretty nice as well. well it will still be on the list of things to eventually buy...

[orangettecoleman]

bumping to ask: how would I go about getting a VCO controller compatible with the rolls mo2020? I googled around and looked on the bay and didn't find anything...

[anti-zarzutzki]

the 1.2-5V is a strange range.
for CV control... it depends on how you want to control the oscillator
moog has a "control processor" that has a lot of your basic CV modules and is in a standalone box
it outputs 0-5V by nature but with the CV mixer on there, you would be able to scale and offset the signal for the rolls

the control processor does cost a lot more than the rolls though so it might not be what you are looking for