[PD] ehu abstractions to be released

[altern]

> Wondering about these though, are they from iemlib? mixed? something 
> else?  Thinking they should probably be replaced by native vanilla 
> abstractions/subpatches if/wherever possible.
> 
> counter prepend gate

sorry i think i did not understand you at first, i thought you where 
talking about all externals used, but obviously you were talking about 
the three above. I am trying to find where do i use prepend. Some code 
is pretty old, and i dont remember. Is there a way to find this apart 
from opening the patches and searching visually or running ctrl+F ?