It's not the tool mate.
It's just like saying you're a forensic scientist when in fact you're a general doctor. And then you meet an actual forensic scientist who tears you a new forensic asshole.
I don't think of myself as a musician when I DJ. I just play songs musicians have made, for people's enjoyment.
I'd probably describe a controllerist/turntablist as a musician. Although I'm not a big fan of that kind of music.
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