The One Word Delay Audio Effect Rack is a great device for adding some life to live vocals. If there's a single word or phrase you want to emphasize, this device allows you to add delay to just that phrase, while keeping the rest of the vocal dry. Check out the video and head over to DJTechTools.com for the full explanation and the free download.
More Live Performance Techniques with Playing Live with Ableton Live Video Course
If you find this trick useful, it's the kind of thing you can expect from my in-depth video course on performing live with Ableton Live. It consists of well over two hours of video material and a collection of presets that will help you get your music from the studio to the stage. Check out some sample videos below.