possible string configurations

up to 10 strings: A0(27.5) D1(36.7) G1(49.0) C2(65.4) F2(87.3) a2(110.0) d3(146.8) g3(196.0) c4(261.6) f4(349.2)
7 string bass:    A0(27.5) D1(36.7) G1(49.0) C2(65.4) F2(87.3) a2(110.0) d3(146.8)
7 string guitar:                      A1(55.0) D2(73.4) G2(98.0) C3(130.8) F3(174.6) a3(220.0) d4(293.7)

up to 12 strings big thirds: A0(27.5) C#1 F1 A1(55.0) C#2 F3 A2(110.0) C#3 F3 A3(220.0) C#4 F4

overall highest note (fret 26): g6(1568.0)