You can do this. You simply treat the computer running Battery like any external instrument.
If your MIDI controller is controlling Battery, hook it up to the computer's MIDI port (if its USB capable, that's fine too). Hook up the audio outputs from your comptuer to the audio inputs of the boss unit and BAM, your recording Battery. If you don't have a dedicated audio output for your computer, you can use your soundcard output...no need to buy a dedicated one.

But if you are serious about recording, you may want to sit down and spend more time with Cubase (or any recording software) and figure it out. It will allow you to use Battery as a VSTi and also do MANY more things than what you will be able to do with the Boss.

"I flew single engine fighters in the Air Force, but this plane has four engines. It's an entirely different kind of flying altogether. " -Ted Striker

thanks for the response. i bought a very cheap version of cubase, (cubase se) for around $100, and it has given me nothing but headaches. i even hired a pro to come to my house and teach me, but between figuring out the external audio settings, midi settings, latency, etc. it was all a bit much. plus, i have never been able to load battery 3 into cubase as a vsti, it never works. i dont know, it just seems as though it'd be simpler for someone like me to have a more 'plug & play' type of setup, rather than continue to bang my head against the wall because i cant figure this thing out. but i must admit, i have thought about trying again with a different program..

A friend of mine recommended MACKIE TRACKTION..do you know anything about this program?

Have you read the manual? Cubase has a pretty good manual. You can look specific things up in the index and it will point you to the page that discusses that topic. The pdf manual on the install disc is extensive. Honestly, I think Cubase is one of the easiest ones to use. I own Tracktion and Cubase. Tracktion is different. In many ways it is easier once you understand the workflow but I think either one will require a bit of reading if you aren't familiar with recording. Cubase works more like a mixing console. There's sends, inserts and buses for routing effects and subgroups. Tracktion is extremely linear. No sends. No inserts. No buses. Everything is pretty well in one screen and in one manner of workflow.