>real-time zero-crossing detection with sample-rate precision.
this is something that is super simple to implement. (..) i also don't understand why such an easy tool has never been put into vanilla pd.
there are so many more simpler and common things that weren't implemented in vanilla before zero crossing, but yeah, like I said, you could easily do that in [fexpr~] (that's vanilla).
also there's a zerox~ object cloned from max in cyclone, btw.