Post your tips & tricks here!
How high of a frequency do you desire for color mod?
Y-rotate has its own oscillator - which can be assigned a waveform type - sin,tri,square,line.
That depends on the resonant frequencies of the image(s) I guess. Up to the 5th or 6th harmonic at least, I'm thinking... and could you add low and high frequency cmod together at the same time?
I'd say on the x oscillator, use a line wave (which would simulate a sawtooth wave) and use your desired wave on the y-axis. if you don't want that line from the end of the draw back to the beginning, click 'blanking' by the built-in preview! Hope that helps.
As bgovetas has mentioned, it is quite easy to accomplish this using Maxwell.
Here are some more in-depth instructions:
Adjusting the "phase mod" of OSC Y will modulate the phase over time (make the shape move) - The amount applied adjust the rate at which the phase modulates (speed of change)
Very basic FM waveforms can be generated by the following:
Set the phase-offset inter-frame modulation type to LFO 1 and adjust the LFO 1 frequency to somewhere in the range of 0-4 and adjust the phase modulation of LFO 1 to taste.