Thanks for the comment, and yes I can describe my setup for you...
Here's an image of the typical setup...
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It's basically a subwoofer from an old Creative 5.1 surround system I had for my old desktop computer and a flash. The shots in this thread were lit with two flash units, but the setup is basically the same no matter how many flash I use. The fluorescent light to the right isn't used, it's just there from when I shoot smoke, and I just pivot it out of the way for water drops or paint drops.
Take a speaker, the subwoofer works good because it's got a flat face, and cover it with plastic. I'm using the type of plastic you see used to cover your windows in the winter, and I just double-sided tape it to the speaker, making sure it's fairly tight. If it sags or has wrinkles the paint won't jump off right, or might not jump at all. The tighter, the better, because it reacts much better to the sound waves coming out of the speaker. Set your flash on either side, or both sides, and that's pretty much it.
I use wireless triggers, and set the flash to 1/64 or 1/128 power, and shoot ISO anywhere between 100 to 800, depending on how many flashes I'm using, how much power the flash is set to, and if I'm using one or two. Any lens will work, I've used the 100mm L macro, the Sigma 18-200mm OS, Sig 70-200mm f/2.8, Nifty Fifty, etc.. Lens choice doesn't matter. Set to manual focus, and put something on the speaker where you're placing the paint so you can set focus. I normally stay around f/8, but I have done shots at f/4 and f/2.8, trying to get a little "artsy" with the DOF. Shutter speed around 1/250, but I've done slow speeds, like 1/15-1/30, and it gives a pretty cool "fireworks" effect to the shots, like this one which was at 1/15...
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There's a lot to be done with different apertures, exposures, etc., but the initial setup is basically the same. I put the camera on a tripod so the focus point stays where I want it, and I either use a wireless shutter release or I just stand there with my finger on the shutter. Burst mode of course, and it doesn't matter if you use spot metering or not because you're in Manual. Also doesn't matter about single-shot, AI Servo, etc., because you're set to manual focus.
The music is controlled by a cabled volume control that came with the surround system, I can hold it in my hand and raise or lower the volume, and music comes from my Zune. I would imagine that you could just hook up to a stereo or similar and use the volume knob, but you'd need a separate volume control besides what's built-in if you use a Zune, iPod, etc., because they won't get a high-enough volume to make the paint jump high. You also ant at least one satellite speaker so you can hear the music, otherwise you might not be able to gauge when to start shooting in correspondence to when the bumps start. Subs are great for the bumps and rumbles, but without being able to hear the music you won't know when to hit the shutter button.
That's about it I think, simple setup, decent results. The paint I use is just some stuff my daughter had from a window paint set she had, and I just watered it down enough to make it fluid enough to jump. Thick paint won't work, it's just sits there, it has to have a little bit of liquidity to it. You can try water and food coloring, but it might end up to clear for the light to hit it, paint is a solid color so it works a lot better.
ROFL!!
