The Tunemaster Chromatic Tuner from T-REX is a tuner pedal which allows you to tune your instrument silently, with the option of using it as a buffer/line driver. It also features specially designed circuitry that cuts tuning noise down to an absolute minimum. When you want to tune, hit the footswitch on the Tunemaser and the signal is muted. The small on/off LED tells you that the tuner is now active. Play any note and the Tunemaster will display the name of the note, and indicate whether the note is flat or sharp. The dot in the upper left corner of the display indicates that the note is raised one semitone. Once the note is in tune, the whole display will light up in green. To go back to playing, hit the footswitch and the on/off LED will go off.