Many modules like shift registers (such as ML Modules’ “Shift Register”) and S&H (e.g. ML Modules’ “S&H 8”) have no way of zeroing-out the contents other than by right-clicking on them to select “Initialize”. Also, sequencers can typically be Reset, some randomized, but not zeroed-out.
Something like CV-MAP can write in parameters, but these don’t have parameters that you can map to it.
So far, for shift registers, the only thing I can do is switch in a burst generator that will rapidly step it through X number of times with a fixed 0 volt input, then switch back to the normal trigger clock and input signal. It seems like a clumsy way to do it though. I could do something similar for “S&H 8”, but again it would be rather kludgey.
I suppose there’s always the risk of collateral damage from resetting all parameters and settings, but for the simple examples I gave it would be fine.