Peterson's proprietary GTR™ Sweetened Tuning™ is designed to improve the sound of musical intervals on guitar, especially 4ths and 5ths. By taking advantage of a few coincidences such as the preponderance of 4th and 5th intervals appearing in many chord positions, the particular E-A-D-G-B-E arrangement of standard guitar tuning (and also the half-step down or "dropped" tuning variation), and the less-than-perfect overtones of vibrating strings, Peterson has introduced a number of slight variations which can maximize the tuning quality of chords.
These guitar-specific Sweeteners™, including G5TH and P5TH in the AutoStrobe™ 490-ST, and GTR in the Virtual Strobe™ series, improve tuning in general but are especially important for "power chords" which feature 4th and 5th intervals. To gain maximum benefit from this feature, the guitar should be intonated (string lengths adjusted) using the strobe tuner in Equal preset, and tuned thereafter using the Guitar (GTR) temperament preset.
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