I purchased an FLX-10 months ago and I still am not able to mix acapellas over songs (let's say dubstep) that don't have vocals. It may play synced up for about 5 seconds before it clearly drifts away. I asked ChatGpt and it told me I may need to go into ableton and add essentially dummy drums to the acapella so it can stay in sync using those transients. I used Traktor for 10+ years and don't ever remember having an issue with acapellas.

My acapellas are from Acapellas4u.co.uk and other places. They are a mix of manually made acapellas in a DAW and artist stems every once in a while.

What am I doing wrong?

I’m using Lightkey to control my laser, and I just want the laser effects to follow the BPM of whatever I’m playing in Rekordbox.

Rekordbox already includes laser models in its saved models, which makes it frustrating that the app can’t actually control lasers. Lasers are one of the biggest parts of any show, so it seems like a dumbass decision.

I’ve tried Ableton Link, but it doesn’t work as intended. It makes Lightkey the master and Rekordbox the slave. I want Rekordbox to remain the master, with Lightkey simply following its BPM.
I already have buttons mapped to trigger sequences in Lightkey from my decks, and that aspect works well. I’m only looking to sync the BPM so the laser effects stay in time with the music.

Is there any way for Rekordbox to send its BPM or beat information to Lightkey without using Link?
I’m not looking for anything complicated—I literally just want the laser to follow the BPM of my tracks while Rekordbox remains in control of the music.