MusicianCV · TRPiano bass limit
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Pitch and register
The sounding A0 in this example maps to MIDI 21. In 12-tone equal temperament at A4 = 440 Hz, its frequency is about 27.50 Hz.
These examples use sounding pitch with middle C = C4 = MIDI 60. One octave spans 12 note numbers. String examples assume standard tuning.
Example
Sounding pitch / MIDI note number · A0 / 21
Sounding pitch / MIDI note numberA0 21
Try it
Which value would you check first if a DAW labels the octave differently?
Answer
Compare against the MIDI number in the diagram. Applications can use different octave labels for middle C.Related topics
Range and practical registerReferences
Music Theory for the 21st-Century Classroom
Subject-expert review pending.