The GA-2 lets you select either Guitar mode or Bass mode for truly easy operation with automatic pitch detection. The guitar mode supports 7-string guitars (7B through 1E). The bass mode supports 6-string basses (Low-B, Hi-C). A high-sensitivity microphone is built-in, allowing easy and accurate tuning of acoustic guitars.
The GA-2’s Quinta Flat Tuning mode supports the lowered tunings used in heavy metal styles to give more weight to the sound. The GA-2 gives you five steps of flatted tuning, extending as far as five semitones below standard pitch, and supporting even super-long scale guitars that are five frets longer than conventional guitars.
Since the calibration value of 430–450 Hz is shown within the meter, you can tune using the calibration of your choice.
In addition to tuning visually with the meter, you can also tune by ear using Sound Out mode which emits a reference tone to which you can tune each string of your guitar or bass.