A few corrections š
“Not the way I read the manual.”
QDrive stereo playback is always on ST3
“I think you can link mono channels with some of the other features on the board. Maybe mix or matrix does that.”
It’s the “Link function on the preamp screen. Any odd-even pair can be linked.
“We are a mono only set up so we convert stereo inputs from CD to two monos essentially; using a Y cable to split the signal into two inputs.”
Difficult to be sure what you mean here, but Y cables for combining are not recommended. More on that here: Why Not Wye
BJ.
How about just getting a Stereo minijack > 2 mono jack cable, so that iPods, phones etc can use ST1 or ST2?