i have enjoyed quite a few of these!! kinda wish i could post more but if you watch these enough you'll either get recommended similar videos or if you don't like yt algo you can just search the tags they use to find similar videos...searching "synth jam" and filtering to recently uploaded has been a good go-to in my experience

https://www.youtube.com/@thevape5030 - some euro noise freak making absolutely busted homemade synths, very atonal and harsh

https://www.youtube.com/@thebleeplesyndicate - a jam band featuring a guy with a eurorack, a guy with some more orthodox synths, and a guitarist with lots of pedals

https://www.youtube.com/@lepoSsam - everything in vcv rack.

https://www.youtube.com/@mochaburner5611 - harsh noise and free improv drumming

https://www.youtube.com/@stromermutroniks - very nice and clean, hardware demos.

https://www.youtube.com/@superschizoscriptures i think she unlisted a lot of her videos on youtube but i have never seen anyone push fruityloops as hard as she does--and believe me, i've looked.

https://www.youtube.com/@Tapepusher - excessively reddit but he has good production chops

https://www.youtube.com/@whogotwock - guy makes streams where he produces hip hop beats and gets stoned on the regular. he also has quite a few free packs that i've found to be of good quality

https://www.youtube.com/watch?v=Jcs4N88XzaU&list=PLJ_3VhGHcIK7poAD1iUiwgv0pTMlFKc4c&pp=gAQB0gcJCV8EOCosWNin - my own synth jams, generally featuring crunchy distorted rhythmic noise

https://youtu.be/wTmqbuFTESw bonus "not exactly what you're asking for"