I can't give any links, but I've done something similar during a live show. I use a laptop and several keyboard controllers to play and loop music live, the computer providing precise timing that would otherwise make this impossible with a live band (unless everyone was on a metronome).

I've got a piece in C#m at 87 bpm [0]. I'll play a piano instrument which is being fed into a distortion (the distortion makes the beat frequency much more apparent) and slam an Ab1 and A1 at the same time. That's 55.00hz - 51.91hz [0], which gives a 3.09 hertz beating. Or a period of 323.6ms [0]. So you have two notes close together, which sounds very dissonant, they're bass notes which makes it muddy, and it's so distorted, you can barely tell what the actual notes are. But it swells up and down on the tempo like a rhythmic device.

[0] Anyone who looked up a tempo -> ms chart is going to say "WTF, that's not in time with 87 bpm." Which is correct, but because pianos are stretched tuned (and so is the virtual instrument I use), the numbers I provided aren't exactly true. I never bothered to measure the exact frequencies, but I kept adjusting things until everything sounded right by ear.