Using tuner tool, most people just use the standard 440 Hz (right?) I don't change the default frequency. Just start it up, and play the notes, and read the graphs.

For us bass guitarists, the N810 microphone is kinda crappy, so you need some good amplification as well...

Here is a thread where I describe a cable i made to tune an active guitar directly:

http://www.internettablettalk.com/fo...t=20895&page=2

Look near the end of the page.