PRESONUS AudioBox Stereo Quick Start Manual page 307

13.3.5 Scope
The Scope provides the functions an engineer would expect from a digital oscilloscope and is
useful for debugging problems in the studio, such as analyzing crosstalk and noise levels.
There are three signal channels and one math channel. Each channel can either show the left
or right signal of the insert channel, or sidechain input, while the math channel can show the
difference between two of the signal channels. (B and C can be inverted to sum instead, or to
do a polarity flip.)
Each of the channels can be scaled and offset in the y axis, and scaling is shown as percent of
full scale per division. (Full scale is 1.f, equivalent to 0 dB.) All channels can be
activated/deactivated by clicking on the colored channel letter.
The time (x axis) can also be scaled and offset. This setting is for all channels. The units follow
the samples/seconds switch on the left, and offset is shown with a green vertical line.
The scope is triggered from one of the following sources:
• Normally. When the signal level on a selected signal channel (not the math channel)
crosses a threshold level (which is adjusted by the Level control) in the right direction
(selected by the Slope button).
• Transients (selected by the Transients button). This uses the same audio channel,
and the Slope and Level controls still apply, but the transient level is usually much
more narrow: somewhere above 0% and typically around 1.5%.
• External Signals. Notes sent to the scope MIDI input or not sent at all (free).
Engaging Oneshot means that the next trigger will turn triggering off. Retrig will wait for one
new trigger in case you get the wrong signal or change the signal.
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