[PD] pd rookie

[Nano Rosas]

Hello to all!
I'm a young southamerican composer, who is starting to learn to use this great program (or i should say languaje?).
And I have a question: 
which is the more economical way of getting the frequency of an audio signal?
There is no kind of reversed osc~ which functions backwards?
Not to-complex answer will be realy apreciated.
Thanks
Nano
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