It was not made with live-play in mind that much, but instead more for prepared songs that can play without intervention. One thing that could be done though, is to have an empty phrase (i.e. all gates turned off), along with all the other phrases, and then manually recall them using the Foundry expander and the Impromptu CV-Pad. There is an option in the expander to make phrase changes happen at the end of phrases only (synchronously), and so it could be live-played like this.
Although I didn’t have any empty phrases, or even not that many phrases, here’s an example of the setup if you want to know more:
But this method means you have to trigger the phrases’ progressions yourself, which could be a pain for long complex songs. Perhaps another way would be to patch up a gate muting button, and with proper use of a sample and hold with a divided clock, you could synchronously mute the track’s gate when you like.