The Korg GA-40 is a compact tuner designed specifically for guitar and bass. With switchable guitar/bass modes, this easy-to-use tuner offers a clear display of the note you're tuning to and how far flat or sharp you are as well as a Flat Tuning mode to detect drop tunings through five semi-tones. If you prefer to tune by ear, simply click the "SOUND" button and get a reference tone from the GA-40's onboard speaker. An output jack is here for convenience, letting you keep the GA-40 connected all the time between your guitar and amp for performances and recordings.