Due to the subjective nature of the audio recording, we really cannot delve into the specifics of how to properly mix and master your Line 6 recordings. We can, however, point you in the right direction to some sites that offer great information on how to get your recordings mixed and mastered properly to sound like they were created in a pro studio!
Ask Video
http://askvideo.com/
Provide great instructional DVD's on a wide variety of recording and music creation programs.
Keyfax NewMedia
http://www.keyfax.com/
An independent music technology music support company that offers many on-line videos and DVD's.
Groove3
http://www.groove3.com/str/
Another great site featuring instructional videos on many music technology products, programs, and techniques.