Oh wow, I just found the little side note about Pro Workout NOT being compatible with the PEXP1. damn.
Is it just a different connector, and could be somehow connected with a little bit of hacking and knowing the exact pin outs? or is it a completely different thing?

Also, are we limited to one expander at a time? Like axon-1 only?

-- nemoy

The sales copy seems to indicate that the AXON port and the future output expander port are separate. The AXON ports on other ALM products only connect one at a time, as did the output expander port on PNW, so I'd expect it's one-of-each.