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Detecting Pitch
The Pitch Detection command is an audio-to-MIDI converter; it creates
MIDI note and pitch-wheel events from audio events. The audio must be
monophonic; that is, there can only be one sound or instrument playing
at a time. Pitch detection does not work well on events containing
harmonies or multiple sounds at once, or on spoken words or sung
consonants.
You must set a few parameters to assist Pro Audio in detecting pitch and
creating appropriate MIDI events. You may need to experiment with
these parameters in order to achieve the best possible conversion. The
parameters for pitch detection are as follows:
Parameter... Meaning...
Pitch Range The range of notes you expect to find in the selected
audio material.
Threshold (%) A percentage value indicating how strongly-pitched
each grain of audio must be before it is considered to
have pitch. Lowering the threshold will allow less
strongly-pitched material to be accepted as notes. For
example, if you’re converting a fretless bass part to
MIDI, you should probably set a very low threshold.
Minimum Duration How long a pitched segment of audio must be before it
will produce a MIDI note. Increasing the duration may
help reduce the number of glitches.
Bend Range How far a note can be bent in semitones. For example, a
Bend Range of 1 or 2 might work well for a guitar part
with heavy vibrato. The Bend Range value should also
match the range set on your synthesizer’s pitch wheel.
Bend Spacing How frequently pitch wheel events may be added, in
ticks.
Destination Track The track on which Pro Audio should place the resulting
MIDI events.
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