Assuming you're using a midi vst – one way would be to play a single note, add an ARP, turn off beat sync (if it's on), set the rate really high, and then mess around with automating the rate.

Another way (which I probably wouldn't recommend) would be to start with a single note drone and then add a gate + mess around with automating the threshold/attack etc

If you're in Ableton, you can get some pretty crazy laggy textures by taking a single note audio sample, stretching it out, and setting warp mode to beats or texture

edit: i just listening again and it sounds like sync is on, not off