User Manual

MOTU AUDIO TOOLS
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ANALYSIS MENU
Choose the desired form of audio analysis from
the Analysis menu (Figure 10-1). For details on
each analysis pane, see the following sections of
this guide.
LEFT/RIGHT INPUT
Choose the desired channel(s) you wish to scope
from the Left Input and Right Input menus
(Figure 10-1). These menus display the To
Computer channels configured in the MOTU Pro
Audio Control web app. The number of channels
shown is controlled by the From device to
computer setting in the Device tab. For example, if
18 channels are specified, you’ll see 18 channels in
the Left/Right Input menus. Use the Routing tab to
map desired audio sources (listed across the top of
the grid) to the To C omputer audio channels, as
demonstrated in Figure 8-7 on page 68.
Figure 10-2: The ‘From device to computer’ setting determines how
many channels you see in the Left Input and Right Input menus.
FFT AND SPECTROGRAM DISPLAY
The FFT analysis pane displays a real-time Fast
Fourier Transform (FFT) frequency measurement
and spectrogram “waterfall”, as shown in
Figure 10-3.
Spectrogram
The spectrogram scrolls from top to bottom,
where the top edge of the display represents what
you are hearing “now”. Color represents amplitude
along the left/right frequency spectrum. The
amplitude color scale runs from black (silence) to
red (full scale) as follows:
Figure 10-4: Spectrogram color-to-amplitude spectrum.
Figure 10-3: FFT and Spectrogram display.
View
controls
Y-axis labels
for FFT display
Horizontal
controls
Vertical
controls
Spectrogram
controls
Grow handle
FFT curve
Black Blue Green Yellow Orange Red
Silence Full scale