How to record music with an Audio Mixer And A Audio interface?

The primary problem you are having appears to be in the use of the Alpha Desktop Recording software and interface. You need to dig into the manual a href="http://www.lexiconpro.com/product_downloads/7/manuals/AlphaManual18_0346VB.pdf" rel="nofollow"http://www.lexiconpro.com/product_downlo…/a and read it cover to cover and try to understand what it's all about. All the information you need is in there. If you are still confused, you best contact then would be the folks at Lexicon Support - a href="http://www.lexiconpro.com/support.php" rel="nofollow"http://www.lexiconpro.com/support.php/a You can also ask them about running a line from your amplifier to the recording interface. Anytime you try to connect an amplifier to any input on another amp or preamp, you need to be concerned about the strength of the signal going into the other unit and how music and what kind of signal that input jack was designed to handle. You can damage your equipment if you do not make sue the the input and outputs are compatible on all the equipment you are connecting.