How to access output 13 and higher in AU Lab?

Hey all,

I'm trying to get AU Lab working in a configuration with 17 stereo outputs (or 34 mono). I'm having a problem in that when it comes to assigning the output from a generator channel strip it only shows outputs 1-12 (next to the meters). I can't find any way to make the rest of the outputs appear, so I can't assign the generators to those outputs.

Anyone have any idea how to do so?

TIA,

Martin