Dec 12, 2007 07:55 am Welcome,
You're not very specific in your post.
What type of mic are you using? dynamic, condensor, etc.
Phantom power turned on?
How are you getting signal out from the mixer?
what type of interface are you using?
Where are the headphones plugged in?
You say you're hearing what you're playing from the mixer? that's not very detailed, pre-recorded signal? incoming signal?
Just to armchair, follow these basic generic steps.
Mic plugged into mixer channel.
Phantom turned on for condensor mic.
channel signal sent to mains.
cable from mains over to audio interface (soundcard, or whatever you're using to convert analog sound to digital bits)
On PC, tell software what device to listen to.
In software, tell software which input channel to listen on, or create a track to receive signal.
(optionally) arm track to receive input.
Press R - Record, and incoming signal from mic should be getting recorded into track in software.
When done, press play and listen to your greatness =).
If you're using a UCA200, then you may have to tell your recording software to use the USB codec as inputs and outputs.
hope that helps.