I assume you want stereo outputs? There are several options. You are basically describing a portion of a monitor mixer, but you could also do it with a mixer that has a bunch of effect sends. Basically each channel has a set of "sends" that route the signal to its own discrete output. Each of these sends has it's own level control, so you can actually send a ...
Depending on the number of playback devices, you may have to use two devices:
an input switcher (to select one of several inputs),
and an audio distributor or splitter. This is a device that takes one or two inputs, and distributes the signal to multiple outputs. Often each output will have its own gain control. You can get these with at least 8 outputs.
After reading and watching videos on YouTube I came to the realization that is obvious to any mediocre+ sound engineer. I come from field of biology so please excuse my ignorance on the matter.
Behringer Xenyx QX1202USB holds four microphone inputs. In each channel, one is an XLR input and one is regular 1/4" line in. It turns out that XLR input (with three ...
I just wanted to add a bit more details to Michael's answer regarding how to make it work with the UFX1204. I know it's 5 years later, but the manual doesn't properly address this trick.
First, send channels you want to hear effects on by turning their individual FX knobs. Press the FX ON button as well in the MULTI-FX section.
Then send everything on the ...
Some Behringer mixers have dedicated mon fx sends like the below (from the PMP1600):
Other Behringer mixers (e.g. the XENYX X1204USB) don't have that option and here you have to patch back the FX send into an unused channel and from this channel send to the monitors in question (but DON'T send to the FX send - it will create a feedback loop!).
Note that ...
The issue you are facing might be caused by a phase inversion between your two stereo channels.
This phase inversion might occur at various points in the chain :
The recorded backing track might have a phase inversion
The cable used to connect the player to the desk input
A phase inversion switch activated on one channel in the desk