descaler lets you choose any Scale in any Key on any Stringed Instrument, and then lets you customise your instruments tuning to whatever you like. So if you play the Guitar in open G, or the 7 string guitar in D, the Banjo in Mountain Minor, or the Mandolin, Bouzouki, Cittern, Diddley Bow, Double Bass, Alto Guitar, Baritone Guitar, Bass Guitar, Cigar Box Guitar, Eight-string Guitar, Electric Guitar, Tenor Guitar, Lute, Banjolele, Baritone Ukulele, Concert Ukulele, Tenor Ukulele... you can find the scale here.