"The problem we're having is getting reverb in the Aux mix. We're only using one (currently).
The DL1608 only has one reverb When we do get reverb, it's only on one channel.
You must mean... only in one side of your headphones? All the other channels are dry.
Sends are all up.
You said sends as in plural, yet you said all the other channels are dry.... confusing, maybe you mean masters are all up? If sends are all up then all the input channels will go to the reverbyou want to hear reverb in a monitor mix???
first, Master Fader's monitor mixes are mono,... but you can link two adjacent mixes together to form a stereo mix, commonly used for in ear monitoring.
Assuming that you are using a mono mix,... all you have to do is make sure that the reverb send for any "input channels" that you want going into the reverb are turned up,
and set the reverb
master to "post fader" and turn it up to... oh, somewhere around zero dB, and not muted.
Now, select your monitor mix on the right side,
swipe over so you can see the reverb "return" and turn it up.
EDIT:::
Gee, I'm glad we took the time to help...