It's not going to make much of an audible or technical difference unless you were producing super high quality tracks for a pro studio. I believe BIAB is going to render it's tracks in 44.1 / 16. If you set up your DAW or RealBand to 44.1 / 24 then import the BIAB tracks it should offer to convert them to the new rate.
Alternately I think you can open your song project in RealBand, change the rate and it will convert any existing tracks to the new rate.
44.1 / 24 will take up more space on your hard drive but not much.
There are varying opinions and uses for different bit depths. Copy/Paste this into a Google search and read a few if you like.
44.1 16 bit vs 24 bit
Or, maybe someone here would like to write a technical summary.

Last edited by Tobias; 12/29/16 09:06 PM.

Does the noise in your head bother me ?