1 2 3 4 5 9 8 6 7
220 * (1/4) = 55 = A1
220 * (2/4) = 110 = A2
220 * (3/4) = 165 = approximately E3 (164.8)
220 * (4/4) = 220 = A3
220 * (5/4) = 275 = approximately C♯4/D♭4 (277.2)
220 * (6/4) = 330 = approximately E4 (329.6)
220 * (7/4) = 385 = approximately G4 (392.0)
220 * (8/4) = 440 = A4
220 * (9/4) = 495 = approximately B4 (493.9)
Exact frequencies (such as 277.2) are from Wikipedia’s Piano key frequencies.
“It may be quite simple, but now that it’s done….“