a good idea for lesser tracks is to do just this (i.e. on 3 7 9 11)
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if you have a trig directly under the one you want to flip locks on, it won’t ordinarily play anyway… (i.e. Trig5 Track11 under Trig5 Track12) so if the hidden trig is a copy (with different locks) of the upper trig (set to FILL) then it will seem to Fill will a new lock on the same step - it may interrupt other things on certain tracks and won’t work if the tracks are different lengths