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MOTU AUDIO TOOLS
93
Figure 10-17: The Persistence controls.
Length
Length (Figure 10-17) sets the number of recent
samples to show on the plot. For example, when
Length is set to 10,000, the 10,000 most recent
samples are shown.
Decay
The brightness (in Grayscale mode) or hue (in
Color mode) of each sample on the plot is
determined by a linear scale, with the most recent
sample displayed at the maximum value and the
oldest sample displayed at the minimum value.
Decay (Figure 10-17 on page 93) determines the
brightness or hue of the minimum value. When
Decay is zero, the oldest sample is black. When
Decay is +1.000, the oldest sample is fully opaque
(in Grayscale mode) or red (in Color mode).
Wa r p
War p (Figure 10-17) determines the position of
data points after they are first drawn. When warp
is zero, data points remain in the same position.
When warp is positive, they contract towards the
origin (center of the grid). When warp is negative,
they expand away from the origin. The further the
warp value is from zero, the greater the effect.
Using the X-Y Plot
The X-Y Plot helps you “see” the width of the
stereo field of a mix (Figure 10-18). It also helps
you determine if a mix has issues with polarity, as
follows:
If a stereo signal is out of phase, it is not mono
compatible because it can cancel itself out, either
partially or nearly completely, when collapsed to
mono.
Activity on the X-Y Plot What it indicates
Signal activity occurs mostly
along the x = y axis (lower left to
upper right) and the Correlation
meter reading is high
Left and right channels are
predominantly in polarity (the
stereo field is relatively narrow)
Signal activity occurs mostly
along the y = -x axis (upper left to
lower right) and the Correlation
meter reading is low (near -1)
Left and right channels are
predominantly out of polarity
(not in phase)
Signal activity occurs in a
seemingly random fashion
throughout the grid
No phase relationship exists (i.e. it
is probably a wide stereo field)
Figure 10-18: Checking polarity in a stereo signal with the X-Y Plot.
In polarity Out of polarity No polarity
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