Guitar Tuner or Guitar effects Algorithms? I need to explore the algorithm of the digital guitar tuner or the digital guitar effects algorithms.
Is there any Book or articles that you recommend of?

All I know is that relate to DSP.

thanks
Best book on the topic is probably http://www.amazon.com/DAFX-Digital-Udo-ouml-lzer/dp/0470665998.

There is some freeware stuff (very mixed quality) here: http://www.musicdsp.org/

Many companies spend a lot of effort in making good sounding effects and well working tuners to make money with it, so access to "good" non-commercial sources if fairly limited.