If 440 is standard tuning, then I'm lead to belive 432 is half a step, or a full step down . . .? No the octave is divided by 12 440-220=220 220/12=18.3 440-18.3=421.7 which should be the pitch of Ab in A=440 I could be wrong, I don't have a pitch guide, but I'm sure you can find one on a piano tun...