I saw this post on Matrix Synth and it made me wonder if I should change the Bucket Brigade Delay chips in the SS-30M. It's certainly very noisy, so it might be worth the effort.
The video tries to show that new (old stock), unused MN3004 chips are considerabley quiter than those taken from a venerable old Roland Juno.
the SS-30 has three of the MN3004 ICs and replacements are available these days. For example at this link https://cabintechglobal.com/mn3009 there are Xvive parts for sale.
It might work. Or it might be a form of vandalism. One to pponer carefully.