Mixing : Automation : Drawing Automation

Drawing Automation
For more information, see the following topics:
Use the Pencil tool to create automation events for audio and MIDI tracks by drawing in any automation or MIDI controller playlist, including Trim automation if it has not been coalesced.
The Pencil tool can be set to draw a series of automation events with the following shapes:
Free Hand
Draws freely according to the movement of the mouse. In audio tracks, the shape has the number of breakpoints needed to smoothly interpolate and reproduce the automation shape. In MIDI tracks, the shape is reproduced as a series of steps, according to the resolution setting in the MIDI Preferences page.
Line
Draws a straight line. In audio tracks, the line has a single breakpoint at either end. In MIDI tracks, the controller value changes in steps according to the resolution setting in the MIDI Preferences page.
Triangle
Draws a sawtooth pattern that repeats at a rate based on the current Grid value. In audio tracks, the pattern has a single breakpoint at each extreme. In MIDI tracks, the controller value changes in steps according to the resolution setting in the MIDI Preferences page. Amplitude is controlled by vertical movement of the Pencil tool.
Square
Draws a square pattern that repeats at a rate based on the current Grid value. Amplitude is controlled by vertical movement of the Pencil tool.
Random
Draws a random pattern of levels that change at a rate based on the current Grid value. Amplitude is controlled by vertical movement of the Pencil tool.
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The Parabolic and S-Curve Pencil shapes are not available for editing automation.