This is just playing direct from the Biab drive:
Video Reaper-Play-Biab-FrozenSGU.mp4

Remove .mp4 from the 2 zip attachments below and unzip the zip files.
_B140_GB Demo wav Tracks.zip.mp4
_BOGG70S Demo 2 Funky wma Tracks.zip.mp4

The first time you open they will build the peak files.
The wma .rpp will be looking for E: and wav .rpp will be looking for D: (if you have Audiophile Biab) so just point Reaper to whatever drive your tracks are on, let it create the peaks then save the project.