Yikes!
As a lifelong keyboard guy just getting into learning guitar, I find that the six strings on my Telecaster are PLENTY for these old arthritic fingers to keep up with!
15 strings? Seriously? I think you’d need fingers like that creature from the original Alien (Sigourney Weaver) movie to play Barre chords on that!
In fact, I just changed to Ernie Ball Extra Slinky (8/38) strings, which I think I’m gonna like!
(Have thread, will hijack. Wire Paladin, San Francisco).
T’Bolt