In this video Paul Maunder demonstrates and explains Trim Automation In Pro Tools. Getting volume automation right first time is tricky, even for the most experienced mixers. Fortunately, Pro Tools provides Trim as a means of tweaking automation in a subsequent pass.
Check out the full article on the Production Expert blog: https://www.production-expert.com/production-expert-1/trim-mode-in-pro-tools-automation-what-you-should-know