• Middle C = C4
• C4 = 60 = 0x3C ⇒ 261.6255653005986
• A440 = A4 = 0x45 ⇒ 440.0
• Semitone = \(2^{\frac{1}{12}}=1.0594630943592953\)

Hz to Voct

Assuming 1V goes to C4, then to convert Hz to Voct, we want to use logarithms.

• \(f_r=\frac{f}{c_4}\)
• \(V_{\mathrm{oct}}=\mathrm{log}_2(f_r)\)

Pitches and Numbers

Source: University of New South Wales