Graphech 3+3 Ratio Acoustic Guitar Machine Heads Butterbean Open Back (PRN-3422-N0) accessories Tone Shift switch

Tone Shift switch

3-band EQ and overdrive—each switchable on its own

PRS 85/15 pickups are spec’d with 5-conductor wire that is designed to work with all PRS electronics configurations and have been fine-tuned via our TCI process

this is one of our most feature-laden designs to date

Graphech 3+3 Ratio Acoustic Guitar Machine Heads Butterbean Open Back (PRN-3422-N0) accessories Tone Shift switchRATIO patented gear technology RATIO Calibrated Machine Heads incorporate different string gauges into the tuning equation. From Low E to High E 39: 1, 24: 1, 20: 1, 14: 1, 20: 1, 12: 1. We balanced the gear ratios to each string simplifying the tuning process. With RATIO, a half turn is a semi tone! Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.