Wow.
I wasn't to impressed until he juggled both decks. I think he must be rolling the pinch roller with the edge of his thumb.
He needs to hack dual line-outs into that POS ghetto blaster so he can use a mixer.
I place I used to DJ at had cassette decks with pitch adjust on them. I...never used them. Nobody did. Never thought about ripping the doors off and messing with the tape as it played.