Sound engineer/musician here too. The DJ thing makes it easier to get gigs in the sense your clients think they are getting a better deal which works for weddings and private parties $$$$. I don't do it because I know what I don't know about DJ work. The best DJ's I've worked with really knew their music and every style as well. I'd rather split the gig with a GOOD DJ than try to do it myself.
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Purple Frog Karaoke Cuz we all feel odd and love to "croak"