Aimee Mann - Lost in Space

I've got both the regular CD and Mobile Fidelity vinyl version of this album and was listening to the vinyl last night and realized something wasn't right. From listening to the CD version multiple times I know the last song on the album starts off with a low frequency synthesized note. When listening to the vinyl I realized it wasn't there at all! I then listened to the CD to make sure I wasn't losing it and sure enough it was there. I'm not saying it was there but lower level on the vinyl, it's just not there. When I thought about it the whole vinyl album seemed more polite, is it possible that Mobile Fidelity used a different mix? I know there are other folks who like this album but there weren't any threads in the archives mentioning this, so has anyone else noticed it?