PRESONUS AudioBox Stereo Quick Start Manual page 279

Editing Part-automation envelopes is nearly identical to editing Track-automation envelopes,
as described in the Editing Automation Envelopes section of this chapter. The one exception is
that if you press [Alt]/[Option] on the keyboard when using the Paint tool to draw an
automation envelope, you can draw straight lines of any length, which will only use two
envelope points.
It is possible to view and edit two different parameters in separate Part Automation lanes.
Click on the two Part Automation Envelope buttons to the bottom left of the Part Automation
lane to show/hide the two Part Automation lanes. Any written Part automation will be read,
regardless of whether it is currently being viewed in either Part Automation lane.
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