according to this article Kool Herc at some point acquired a GLI 3880 which has a crossfader, but it appears to have been after 1973https://djmag.com/news/dj-kool-herc-soundsystem-sells-over-200k-christies-auction
in an interview in The Record Players: DJ Revolutionaries (by Bill Brewster, Frank Broughton) Grand Mixer D.ST (Derek Showard) recalls that Kool Herc did not "cut", explaining that the transitions "would be all off-beat"
https://i.imgur.com/Pi6VsHr.png
― corrs unplugged, Monday, 18 December 2023 14:49 (four months ago) link