[PD] test audio signals: Are there <~ and >~ objects?

[Peter P.]

Hi list,

this seems to be easy but I can't figure it out:

How can I test an audio signal to lie within a certain range, or just if
it is bigger or smaller than a reference value, and receive the result
as an audio signal as well? Are there <~ an >~ objects or equivalents?

I am having problems search the mailing list archive at
https://lists.puredata.info/search? 
as its search engine gives all sorts of answers which seem unrelated.

thank you for any ideas!
Peter