i've got a pod hd500 that i'm very happy with in the studio.  i'm going to be going live soon and i need a multi-fx device for my amp.  i'm wondering if were to disable the amp modeling on my POD HD500 and use just the fx, if it would sound as good/the same as an M13.  i'm sure that from feature-standpoint the M13 would have more bells and whistles, but given that the effects in my HD500 already do everything that i need them to do, all i'm concerned with at this point is if the HD500 would be a sacrifice "sonically", or not.  i'm also hoping the hd500 is capable of doing the four-cable thing.  anyone?