C6TH TUNING SLIDE RULE CHART FOR 8 STRING STEEL GUITAR - LAP PEDAL | eBay
BLOGoZON No.214 - 8 string (F#BEADGBE) factory tuning C natural octave shapes plus Meshuggah Ibanez M80M
Tosin Abasi: how to master eight-string guitar | MusicRadar
8 string Tenor Guitar mini Strat conversion with color and tuning options (Color: black, Tuning (low to high) for your application: Baritone Ukulele unison (DD GG BB EE))