Welcome to the forum
Can't help on your other recent post about low drum volume, but DCMaguire's suggestion is the only thing I can think of. There are as far as I know only 2 ways to adjust the drum volume, 1 - on the master volume on the side, and 2 - slider 1 (or parameters if in edit mode) whilst in rhythm mode (as DCM said). I take it we're not talking about bounced drums here in which case the parameters of the tracks you bounced to are a factor, as is the volume you had set when bouncing.
On the other point, just to follow Tony's post up, here are the links for Audacity and Kristal (Audacity is easier to use (IMO) if you're not familiar with these programs) -
Tony's right about the 2 methods, the card manager route is better, but if you don't have a card reader, No 2 is your only option (BTW I would advise getting a card reader if you don't have one, they're dirt cheap).
If you use the "line-in" method, set up your PC so that you can hear whats coming in (might have to adjust "line-in" volume on your soundcard) and hit record - Audacity will create a new track and start recording. Make sure to adjust the input volume (microphone symbol)
down so that the recorded audio image does not fill the track (if the peaks fill the track, that should be OK).
That should be enough to get you started - feel free to ask more questions as you go.