OK - I understand now. I don't think there is any way that you can separate the vocals from the guitar if you record them at the same time with one mic. If you used two mics, you could record them simultaneously onto two separate mono tracks - there would be some bleed of each onto the other but you would still be able to do quite a bit with EQ and mixing.

On the other hand, if you jack your guitar directly into the Behringer in a line-in and use the mic for vocals, you could play and sing simultaneously and record them onto separate tracks with no bleed.

Still one more thing you could do - Jack the guitar directly into the Behringer but don't plug in the mic. Play and sing the song. The vocals won't be recorded but you will be playing and singing at the same time. After that is done, you could go back and record a real vocal track later. This is a good technique to use if your guitar playing is actually better when you are singing along with it.

All of my solutions require you to jack your guitar directly into the Behringer. The experts say you don't get as good of a sound that way. But at this point in your (and my) recording, I believe that will help you more than hurt you.

Sub might have better advice....

Scott