Yamaha DTXpress/DTXplorer/DTXtreme

A few weeks ago I discovered here that there is a setting menu for 
live and practice. Of course mine was on practice, so I switched it 
over to live. Up until now I have run a split stereo chord from the 
headphone jack into two channels on a little PA. When I switched it 
to live, the headphone jack had no output. Then,I ran lines from the 
back outputs into the two PA channels, but still no sound. I gotta be 
doing something wrong.

Also, what kind of differences will I find if I ever get the live 
setting to work? It was posted that the volume is raised. Is that it?

Thanks in advance,

Jon in Japan