Use the View Menu to select a display mode. The default is
shows a combination of absolute pitch, amplitude,
relative pitch (intonation), and quality. The height of
the trace shows the pitch, the thickness shows the RMS amplitude, and the color
shows the relative sharpness or flatness: red for sharp and blue for flat.
The bluer the trace, the flatter the note. Quality is shown in the
brightness of the trace: notes below a threshold quality are shown dimmer
than high-quality notes.
- Amplitude shows the loudness envelope only. This is similar to
the display you would see with audio processing applications such as
Audacity. The height of the
trace above and below zero is equal to the peak maximum and minimum signal
If you zoom the time scale very close, you can see the individual
samples making up the waveform.
- RMS Amplitude is similar to Amplitude, but instead of being
based on the peak amplitude of the signal, it calculates the average
amplitude on a root-mean-square basis. This kind of display is more
indicative of the perceived loudness of the signal.
- Pitch show pitch only. Readout is numeric using MIDI note
numbers, where middle C = 60. A value of 65.02 is 2 cents sharper than an
equal-tempered F above middle C.
- Quality shows quality level only. Quality is a measure of
confidence: an indication
of how strong the evidence is that there really is a note being played at
that pitch. It has nothing to do with subjective evaluation of the tonal
- Spectrum shows the frequency spectrum,
or the Fast Fourier Transform, of the
sound. If recording or playback is happening, the FFT shows the spectrum of
the live sound. Otherwise, it shows the spectrum of the sound at the point
of the needle visible in other display modes. Note that when Intonia is set
to record, the display shows the spectrum of
the sound being picked up by the microphone, even when the pause button is
When the view mode is Pitch or Composite, a
piano keyboard is displayed on the left edge of the screen, with
a green dot at A-440.
The View Type may also be selected on the
View Tab of the Options dialog.
Clicking Show Deviations will analyze a selection for pitch accuracy. If a
region has been selected, the selected
time interval will be analyzed, otherwise the entire recording is analyzed.
- Pitch is the arithmetic average: it indicates whether the
selection tends to be flat or sharp, and by how much, where a half step is
equal to 1.000. A change in the A
Frequency from 440 to 441 corresponds to a pitch change of approximately
- Deviation is the RMS average: it estimates the accuracy treating
high and low as the same. The calculation gives more weight to the notes
that are farther off pitch.