User Guide

MOTU AUDIO TOOLS

X-Y PLOT

The X-Y Plot window (Figure 9-13) graphs the

amplitude of a stereo audio signal on a two-

dimensional grid.

For each unit of time (i.e., each sample), the

amplitude of the left channel is displayed on the

x-axis and the amplitude of the right channel is

displayed on the y-axis. A thick white vertical line

marks where left channel amplitude equals zero; a

thick white horizontal line marks where right

channel amplitude equals zero (Figure 9-13).

There are also thick white diagonal lines for y = x

and

y = -x.

Metering

Level meters are displayed above and to the right of

the graph for the left (green) and right (red)

channels, respectively. An additional Correlation

meter (blue) is displayed on the right. This meter

displays the correlation between the two channels.

The higher the meter, the higher the correlation

between the two channels. Below are a few

examples:

Figure 9-13: X-Y Plot.

Situation Meter level X-Y Plot graph Mathematical

relationship

Perfect correla-

tion

+1 Diagonal line

going from

lower left to

upper right:

y = x

Zero correlation 0 No discern-

ible pattern

None

Perfectly out of

phase

-1 Diagonal line

going from

upper left to

lower right:

y = -x