Tomsline AT-07 Tuner Pedal The AT-07 is a chromatic pedal tuner in a full-metal shell with a high-definition color screen showing note names, tuning meter, calibration, pitch, and flat settings. It features A4 pitch calibration (430–450 Hz), four levels of flat tuning (b, bb, bbb, bbbb), a true-bypass footswitch design, and standard ¼″ mono input/output jacks for guitar or bass....