Problem with Strikers 1945 II

I downloaded Strikers 1945 II on a FTP,there are 21 files named Strikers45-2.rar to r19 for the iso ( OK ) but....

There is only one file named Audio.rar of 200Ko,who want of course just one Mp3.

The cue sheet is for just two files (iso+ one audio track) so all of this seem good but i can't believe that in a Saturn game there is just one music
At least the Playstation version uses the soundchip to play music instead of CD-DA so I'd guess the Saturn does the same thing. It's an arcade conversion, and most boards (of that age at least) used on-board synth chips for music.