It sounds like I'm being ridiculous but Do some DJs not use Headphones?
Waveriding
http://www.digitaldjtips.com/2010/07...out-headphone/
http://www.youtube.com/watch?v=SqvU_...eature=related
http://www.youtube.com/watch?v=wAPYL7wbBH0
http://www.youtube.com/watch?v=3XtNbmMt-OY
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