What happens when you double-click on a tool in the Pro Tools toolbar?

When you double-click on a tool in the Pro Tools toolbar, the tool is activated. This means that the selected tool becomes the primary tool used for the current operation you’re performing in your session. For instance, if you double-click on the Grabber Tool, it will be activated, allowing you to easily manipulate clips or audio tracks as intended.

The activation of the tool through double-clicking is a quick way to ensure that you are using the right tool for your tasks in Pro Tools, thus facilitating a more efficient workflow. It's essential for users to be familiar with this action, as it often serves as a time-saving method in audio editing and mixing processes.