From Mark Hammer-
"If you want a preview of what a ring modulator sounds like or how it would affect your playing, simply replace the LFO-range cap in any modulated device you have with something about 1/4 to 1/10 that value. In the John Hollis "Frobnicator" pedal design (available at
www.geofex.com) that step is already done for you, but you can also do it to any chorus, flanger, tremolo, vibrato, phaser, etc.,, as long as there is an LFO somewhere in the circuit. "
This statement leads me to belive you can indeed and that to do it you want to change the LFO range cap to a smaller value but probably not as extreme a change as is suggested here.
Now which cap that is I dunno.....I could be wrong about the whole idea but I think this is what you want to do.
Anyone want to help me out here? :O)