No Sub-Mojo

When in doubt, read the manual...

"We don't need no stinkeen instructions!". The thing that's odd is the "normal - separate" switch under the pre-out/main-in jacks. Maybe "normal" deactivates the pre-out signal. I'll bet the manual says to set the switch to separate to activate the jacks. Please verify this in the manual and give it a try.

No. "Steenking" is east-coast, "Stinkeen" is west-cost. I lived in ’Vegas for 13 years so I know.

You can use a set of your tape-monitor "record" jacks to feed your subwoofer. However, these are usually fix volume output (also called "line level") so the subwoofer you attach them to must have some kind of volume control (Note: The Pre-out jacks are variable loudness). It doesn’t have to be remote control but line-level volume is "all the way up" that is, really loud, so you have to have a way to turn it down to sane levels. Why don’t you sell enough of your 12-13 subwoofers to buy one (or two) with remote control?

what kind of sub do you have? Does it have remote control volume? If it does, you have more options.

Good luck!