Really depends on you input.  We had great success with pitchamdf in  
our blues accompanist.  a student project here came up with a  
different answer -- will see if I can find the results -- think the  
answer was YIN which I think we do not have (yet).

==John

Quoting peiman khosravi <peimankhosravi@gmail.com>:

> I'm wondering if anyone has any opinions about what is the best opcode for
> fundamental frequency analysis in Csound?
>
> Many Thanks
> Peiman
>