As with any clean booster, parang pinupush mo yung volume ng mabuti until it slightly breaks up. That's how it works. You can try to raise your volume to the point where there's subtle break up, then use the EPB to push it more.
If you want a dedicated OD, the EPB won't cut it. Pero if you want to push a clean amp into subtle OD, you've god to push it hard via the EPB to the clean headroom's limit -- often times at a loud enough volume.. Or you may push a slightly overdriven tone into a dirtier mess with the EPB.. or add some extra push on a dirty tone.. That's how it works.. Mas nagiging dynamic at glassy (from my experience) yung pushed sound compared kung hindi.