After searching around the MST file from Metal Arms after uncompiling it, I found a file in it that contained a huge amount of sound data in it (about over 30 minutes of audio, some of it being in different frequencies if that's any helpful). Thing is, the RDG format isn't an audio format. snd_smpls.rdg in particular seems to be the one of the only files other than the WVS files that has audio and not scripts. Because of that, I don't even know which topic this post goes in. Anyway, I don't see any readable words in snd_smpls. All I know is that the very start of the gibberish data were voice clips from the Droids (i.e. "Sector is secure! Let's move on!").
snd_smpls.rdghttps://mega.nz/#!XAJkCR7C!q_2cGkrnwVHtrCZl1S58E28xWUV0dJ3wTYEq1oOv_F8
EDIT 2: If it helps, I've included the link to the file snd_init.rdg. It's not a sound file, but it was the only other file with "snd" in its name. Perhaps that could help with converting snd_smpls to something readable.
snd_init.rdghttps://mega.nz/#!PVAUxbJQ!sitoTesBsM8Eye3giKVIWQEnxnDPlIbz32h40BgRarU