Depending on what is sounding weird, it could be a few things.
If the instruments are just not correct you’ll have to change them. Native instrument map can be found in this post. Native Instrument Map - #8 by Alusq
Anvil Studio is a good DAW for this since the default midi instruments line up with the FE native instrument set.
Instructions like bends in the midi may not work very well either. When importing midfix4agb should take care of it if you have that set up in FEBuilder. If not you can go to the old option tab and check the boxes to ignore instructions potentially causing the issue.