User Manual

MOTU AUDIO TOOLS
88
ANALYSIS MENU
Choose the desired form of audio analysis from
the Analysis menu (Figure 11-1). 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 11-1). 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 To Computer setting in
the Routing tab (item 30 on page 15). 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 Computer audio channels, as
demonstrated in Figure 8-7 on page 72.
Figure 11-2: The ‘To computer’ setting (item 30 on page 15) 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 11-3.
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 11-4: Spectrogram color-to-amplitude spectrum.
Figure 11-3: 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