Help locating Dreamcast music (SC 5)

Im trying to extract the music from the game Space Channel 5 for Dreamcast. The reason is because theres some tracks of the game that are not present in the OST.

You see, in the game theres the song for each stage and also another song for the "battle" sequences (dance and shoot sections). The laters song were not included in the OST.

The music seems to be compresed in ADX files inside a AFS file, theres one file for each stage (ADXDATA_R[n� of stage]) for a total of the 4 stages that the game have, one for VOICEDATA and another for each stage that is SANDATA_r[n� of stage].

Now, the problem , when I explore (with AFS Explorer) the ADXDATA, it contains the music for the rounds, but only the songs that are in the OST. Those battle sequences songs are not found anywhere.
In the VOICEDATA theres obviously all the voices of the game, and the SANDATA files are a bunch of .bin that doesnt even reach 1 mb each (and the names seems to coincide with the DX of the ADXDATA files).

Theres also the .SFD files that are the sounds for the FMV videos.

And at last, theres some .RB files that I dont know how to open them, some as little as less than 1 MB and others around 3 or 4 MB. Could those files contain music? I dont know where to search more.

If someone have any experiencie of ripping thi sgame or Dreamcast game that could guide me I would apreciate it.

Thanks!