EVH Red D-TUNA Drop D Tuner for Original Floyd Rose® Tremolo 555-0121-466 | eBay
Eddie Van Halen EVH® D-Tuna® Drop D Tuning System!
Guitar Shop 101: Installing an EVH D-Tuna on a Floyd Rose - Premier Guitar
PSA To everyone who has a Floyd Rose, or just hates downtuning: get a Digitech Drop pedal! It has 7 stages (plus an octave, and octave+dry), each one tunes your guitar 1/2
KEEPING YOUR FLOYD ROSE IN TUNE. — Diamond Guitars
recessed floyd rose questions | Unofficial Warmoth Forum