Keeping all my "unique" or expensive or hard-to-get pedals. KoT, Honey Bee OD, Korg SDD 3k, etc. I don't really use them, but it's nice to have them. No, the Axe has all I could possibly want internally. I think anyone that THINKS they still need external pedals (that do generic functions) just hasn't tweaked enough. Sure, there are some things the Axe doesn't do, but for everything else, there's Mastercard.