[PD] centered vibrato question

[Libero Mureddu]

Hi all,

In the attached patch, I´d like to have a vibrato that is the same (in
pitch) both above and below the carrier frequency.
I don´t know how to do it in pd.
So far I found a solution at the csound mailing list.
in csound a solution is to use  "cent" that calculates a factor to
raise/lower a frequency by a given amount of cents.

---- csound example -----
kvib      oscil     1200, 1, 1
  a1        oscili    30000, 440 * cent(kvib), 1
----- end csound example ----
here is the link from the csound mailing list.

http://www.nabble.com/Simple-vibrato-question-%28was%3A-Not-a-Number-ierror-in-pow-operator%29-tf21490.html#a58740

thanks a lot
libero
-- 
Libero Mureddu
Vanha Viertotie, 21 as 417
00350 Helsinki
Finland
http://webusers.siba.fi/~limuredd/
http://www.myspace.com/liberomureddu
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