If you are using the line input on the Live, just use a Y cable from your dist/preamp.
If you need a load for a head,
1) use an external loadbox
2) if you are recording, the digital out has the dry signal (no speaker emulation) on one side. You can then take this track, once recorded and run it either through 2 Torpedos, the true stereo WOSIII plug in or record multiple passes through a single Torpedo
3) use a third party d/a and take the Live's spdif out back into the cab, an old dat player is one option, as are some inexpensive interfaces for gamers/appleTV etc that can be found on ebay.
Andy