The recorder in BB is a very basic recorder. One track and I don't think you can do much editing with it. I think it's more of a scratch pad sort of thing. I've used it a few times and didn't really see much of a way to do any kind of editing.

Real band is a much better program to use for recording your live tracks. Close the project in BB and then simply open it in RB. Add the live tracks you need to add.

In most cases, the factory sound card in the computer might do OK but often will exhibit latency with certain kinds of tracks..... mainly synths. For a smooth, flawless, and latency free playback/recording experience, you need a dedicated interface that can run with ASIO as the driver. These interfaces tend to be external and connect through USB and get set up as the default sound card for the musical programs in the computer.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.