> It's a guitar tuner. How low can you go on a guitar?!? Some base fellows can go very low :-) _________ WWIK, but: Std - E - 83 Hz Std Bass - 41(.5) Hz. 8 string Bass - ~ 20 Hz Custom ... But - is the lowest note a pure sine wave AND if not does it have only harminics or is a subharmonic mode possible AND if tuning, would you not want the fundamental only if at all possible. Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .