pitch: reference to nopitch = -999 in midi

Author: tremblap

doc/BufPitch.yaml

@@ -13,7 +13,7 @@ see-also: Pitch, BufLoudness, BufMelBands, BufMFCC, BufSpectralShape, BufStats
 description: |
   Implements three pitch descriptors, computed as frequency and the confidence in its value.
 discussion: |
-  The process will return a multichannel buffer with two channels per input channel, one for pitch and one for the pitch tracking confidence. A pitch of 0 is yield when the algorithm cannot find a fundamental at all. Each sample represents a value, which is every hopSize. Its sampling rate is sourceSR / hopSize.
+  The process will return a multichannel buffer with two channels per input channel, one for pitch and one for the pitch tracking confidence. A pitch of 0 Hz is yield (or -999.0 when the unit is in MIDI note) when the algorithm cannot find a fundamental at all. Each sample represents a value, which is every hopSize. Its sampling rate is sourceSR / hopSize.
 process: This is the method that calls for the pitch descriptor to be calculated on a given source buffer.
 parameters:
   server:

doc/Pitch.yaml

@@ -11,7 +11,7 @@ sc-categories: Libraries>FluidDecomposition
 sc-related: Guides/FluCoMa, Guides/FluidDecomposition, Classes/Pitch
 see-also: BufPitch, MFCC, MelBands, Loudness, SpectralShape
 description: Three popular pitch descriptors, computed as frequency and the confidence in its value.
-discussion: The process will return a multichannel control steam with [pitch, confidence] values, which will be repeated if no change happens within the algorithm, i.e. when the hopSize is larger than the server's kr period. A pitch of 0 is yield when the algorithm cannot find a fundamental at all.
+discussion: The process will return a multichannel control steam with [pitch, confidence] values, which will be repeated if no change happens within the algorithm, i.e. when the hopSize is larger than the server's kr period. A pitch of 0 Hz is yield (or -999.0 when the unit is in MIDI note) when the algorithm cannot find a fundamental at all.
 process: The audio rate in, control rate out version of the object.
 parameters:
   in: