"I'm moving your thread to the right category (Sound) so the sound engineer experts like blueprintstudio can help out. "
wah eh win already lor. hahah. that sudden obligatory charity feeling.. heheh j/k. sorry been busy with work..
ok it's a little messy, so i'll just explain as simple as I can :
1) you didn't state what model of Xenyx behringer mixer you're using so i'm assuming it's this.
http://www.behringer.com/1222FX/index.cfm?lang=eng
Manual :
http://www.behringerdownload.de/1222FX/1222FX_ENG_Rev A.pdf
apparently the only outs on the mixer that i know of are RCA out, XLR out . and the "Phons CTRL" .i'm not too confident on the theory with "Aux send" / "Mon send" side.. gotta be hands on the mixer myself to try it out. but I think they do "output" signal too.. do try plug in headphones (DO NOT wear them in case it does a loud pop sound that damages your hearing)
2) you're using this...
http://www.emu.com/products/product.asp?product=10447&nav=technicalSpecifications
it has 2 1/4jack ins. and outs. and all the rest of unrelated stuff..
3) you want to record lets say guitar and vocals. 2 mics.
2 mics > xenyx > emu
at the same time monitoring..
so for recording =
mics > mixer > MAINOUTS : XLR female to 1/4jack TRS cables. > emu's analog ins.
OR
mics > mixer > RCA OUT : RCA male to 1/4jack TRS cables (not sure if this is possible, should be la..) > emu's analog ins.
you can make that XLR female to 1/4jack trs at simlim square. usually i go to this shop called "Suang Huat Heng"
4) for monitoring =
emu > 1/4jack analog outs > xenyx mixer's "LINE IN 11,12" (for example) > PHONS/CTRL channel > your headphone lor.
should be alright this way.
otherwise get a RCA stereo (red/white) to male 1/8 jack adapter + then get a female 1/8 to female 1/8 jack adapter(looks like a mini golden pipe) , then headphones.
xenyx mixer > RCA OUT > RCA STEREOtoMale1/8jack adapter + female 1/8 to female 1/8 jack adapter > headphones monitoring.
hope this helps. and do respond if it works. or doesn't.
90¢ worth.