Actually, it's probably that arkhan forgot to shut the sound off when he loads the title screen. If the sound amps aren't turned off, you can hear the data for the title screen actually being loaded. I've noticed this in other CD games (and not just the turbo), and if you have an external amp hooked up (and really turned up) you can hear it really well.
Most op-amps don't actually completely kill the sound; they just drop it to minute levels, so the CD loading noise is there, just usually inaudible.
Something to check for in the next game, arkhan.