TonePros® founder Dwight Devereaux at the GMP factory in San Dimas California with builder Harvey Beck III, checking the new TonePros® equipped GMP's coming off the line. GMP, known for their top quality instruments as played by Duff McKagan, CC Deville, and Alice Cooper, produces 100% of their Tune-O-Matic guitars with TonePros® equipped as standard equipment.
