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You can get some pretty cool glitchy sfx by doing noise sweeps (1xx, 2xx, 4xx), noise arpeggios (0xx), messing around with V01 periodic noise, doing arpy glitchy messes on squares and tri, taking your noise drums and stuttering them really rapidly, etc
This song's (still) not finished, but at frame 16 I have a bit of a glitchy messy breakdown, hehe
The kind of stuff in that video at 6:45 seems like you could just do by copy pasting a row a few times (perhaps with a temporary speed/tempo change, and maybe a D00 or two to get your rows back into alignment when you're done).