Asaki said:
Quantum Leap =/
Seasons 2 and 3 have their music retained from Region 2 UK PAL land. Season 4 is where the real trouble lies. No studio release has the music retained.
So yes, one needs to import both Season Two and Three for music retainment from England which I've already done many years ago. Grab the audio from Netflix and place it with the video from the DVDs for Season Four.