Jamin Jim,
First, welcome to the forum! Also, you didn't indicate how new you are to Band-in-a-Box or to audio production but I hope the program has surpassed your expectations so far.
Bud has given you the best answer but you may not completely understand his answer if you're new to BiaB or audio production.
How familiar are you with the RealTracks Picker columns? The column on the far left is labeled "Direct Input Available" with a response in the cell of Y for yes or the cell is left empty for no.
Direct input is the guitar or piano recording without any added effects. Every RealTracks has a folder. Some guitar and piano RealTracks folders includes a sub folder called Direct Input with the sub folder having the direct input RealTracks audio file.
Some of the RealTracks Picker columns are a great aid to selecting what tracks to use. Simpler Available is another some overlook. It just means there is a RealTracks variation that is not as busy as the main RealTracks.