@R3dSt0rm Jus do this bro
Start OpenIv and make sure Edit mode is on
Navigate to Grand Theft Auto V\mods\x64\audio\sfx\PROLOGUE.rpf
Right click in blank area and choose ImportOpenFormats
Navigate to the extracted folder (should be a td_loading_music folder with 2 wav files in and a td_loading_music.oac file) and select the td_loading_music.oac file
click on open
Job done
Make sure you have 2 audio files named the same as the vanilla files, and they are in WAV PCM mono 16bit format (use audacity or EZ-CD convertor)