Hmm, I’m guessing that a unit can be set up to be switched both on then off by sequential rising trigger.
Looks like a counter will do this.
Then you could maybe invert offset a latch, perhaps adding a slight delay, and mix that result back in with the unmodified latch signal, to turn a latch on off into two rising triggers… would depend on whether a jump in signal, from when overlap when both results are high, counts as another trigger
… I don’t have the module yet to try.
I might keep the 304, rather than having to buy a new 305… I have three mute switches anyway