Mixing : Plug-In and Hardware Inserts : Editing Plug-In Controls : Editing Plug-In Parameters Using a Mouse

Editing Plug-In Parameters Using a Mouse
You can adjust rotary controls by dragging horizontally or vertically. Parameter values increase as you drag upward or to the right, and decrease as you drag downward or to the left.
Keyboard Shortcuts
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For finer adjustments, Control-drag (Windows) or Command-drag (Mac) the control.
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To return a control to its default value, Alt-click (Windows) or Option-click (Mac) the control.