Rekordbox sound crash/slow playback

What you describe would make me consider latency problems first. I don’t see any use for anything but a regular USB cable. There is NO reason your normal single USB 2 cable shouldn’t function properly.

Might want to find a friend with RekordBox (or just with a fast laptop that he’ll let you install RB on) and try that with your controller. It would eliminate the laptop as the problem of the source if the symptoms persist.

<note from moderator>
While I agree with your sentiment about posters reacting to replies they receive, there is no need for any form of “personal” name-calling, however slight. So I have deleted that bit from your post. Imho what remains is a perfectly legitimate reaction while still keeping things on the friendly plane where we like it

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Neil, <inappropriate text deleted> when you ask for help on a forum, you should reply back.
Others reading this might have the same problem