To further explain the exact strings and tuning used in the Gambale Tuning, Frank posted this explanation on his Facebook page, June 10, 2019

"So, here is GAMBALE TUNING explained...and it only took me 40 years to invent this! ADGCEA. It's the same relative tuning as regular guitar but the lowest string is the 5th string A instead of the regular low E. Also, the 1st and 2nd strings are one octave lower. Here's the suggested string gauges. From low to high use strings from an electric 10 gauge standard set. Use only the A D G and B strings for the 6th, 5th, 4th and 3rd strings. The B string will be tuned up a half step to C. Then for the 1st and 2nd strings use a D and a G string from a standard 09 gauge set. These two strings are to be tuned up a whole step so the D will be tuned to E as the 2nd string wound, and the G will be tuned to A as the 1st string.

Regular Light, 10-46 46 36 26 17 13 10 Notes with Octave E2 A2 D3 G3 B3 E4

GAMBALE TUNING 36 26 17 13 24 16 Notes with Octave A2 D3 G3 C4 E3 A3