Preview Options
The Preview options allow you to find new settings without recording the steps needed to locate them.
This is useful if you want to audition changes on automation values without deleting any of the original automation data. When you have found the settings, you can punch the previewed value.
When changing a preset of a VST plug-in while in Preview mode, the change in the parameter settings caused by the preset change is recorded automatically as automation. Note that the plug-in must have 32 or fewer parameters for this to work.