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TWPitch facilitates the use of pitch class notation in SuperCollider. Pitch class notation is a system in which pitches and their enharmonic equivalents are identified by integers ranging from 0 to 11:
0: C
1: C sharp / D flat
2: D
...
9: A
10: A sharp / B flat
11: B
Octaves are identified by integers ranging from 0 to inf. Pitch class 0 in octave 0 produces C at ~8.176Hz. Pitch class 9 in octave 5 produces A at 440.0Hz.
Check out the source on Github.
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