Not a guitar player, but I think you can tune a guitar to play that note.
No amount of testing will protect against incorrect design.
https://en.m.wikipedia.org/wiki/Drop_C_tuning
it's a feature that i will definitely look into adding.
None the less, i will try to add those lower notes(which is way more complicated than it sounds for various reasons).
Not a guitar player, but I think you can tune a guitar to play that note.
No amount of testing will protect against incorrect design.