Turbo Tuner ST-300

The Sonic Research Turbo Tuner ST-300 is a high-precision chromatic strobe tuner pedal featuring a true stroboscopic LED ring display with an accuracy of ±0.02 cents. Its display responds directly to the analog input signal, providing immediate pitch indication without digital processing delay. The tuner covers a frequency range from C0 (16.35 Hz) to C8 (4,186 Hz) and supports five programmable temperaments, drop tuning up to six semitones, and adjustable A4 reference pitch from 300 to 599.9 Hz. It features true-bypass switching to preserve signal integrity and a power output jack for daisy-chaining other pedals. The ST-300 operates from a 9V battery or external 9V DC power supply, drawing approximately 50 mA.