E*nealio,

I've never used that particular Tx, but I found a manual to here: http://www.futaba-rc.com/manuals/6xas-hs-manual.pdf

On the bottom of page 37, it states "You can use both PMXs to create a custom dual elevator function, where you use two servos for your elevator control, one for each side."

It goes on to explain how to use the PMXs on page 38 (the page number at the bottom, not the page number of the .pdf file).

Hope this helps,
Baron