yeah.. pre-installed computer probably is just more troublesome than it's worth...
if you want some funky addition to your booth, then i'd imagine audiovisual - like a couple of webcam type things hooked up to the booth. You could have them showing what the DJs doing with his controller maybe - as it's more interesting than watching someone beatmatching with CDJs.. just a thought! I saw that once when loose cannons played, it was cool

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