The 'reset to factory' is different in RB than BiaB.

For RB total factory reset (to my knowledge) is;
Close RB
Rename the files RB.CFG and Realband.INI to something else.

Then launch RB and it will go through the initialized setup process again and recreate those files.

If you don't like the result; rename the original files back ..

There is a way in Prefs-Drivers area to reset just the drivers and make RB retest/reload these, but the method above also includes other settings and is much closer to an actual factory reset scenario.

Make your sound your own!
.. I do not work here, but the benefits are still awesome