Quick n' Dirty: Looping the Scratch DNA effect in VDJ8.3/2018
FYI: You may get a small click right where it loops, but I don't think it's too bad You can of course change the scratch pattern into any pattern you like
Script used:
add this to your keybord or empty button
up ? repeat_stop 'loopit' & effect_active 'scratch dna' 0 : repeat_start_instant 'loopit' 10ms & effect_active 'scratch dna' ? nothing : scratch_dna 'EAEA.EAEA'