Mike, as I said, I use the 808s in the mains/monitor mode. We generally run Mackie C300s on the mains (left)and 2 or 3 10" monitors on the other side (right). Never could figure out how or why Mackie has that stereo/mono switch; why not just use the stereo fader to adjust output.

What I really want to know is... would I get better mono sound if I input both keyboard channels into the PA, but still only have a mono output?