here is how it works:
1) Install the "State of Art Expansion"
2) Save a 16 bit PCM mono wav file and rename it to 106MySound.gls in Gladiator3_data
3) Delete the chache files 106MySound.1, 106MySound.2, 106MySound.3, 106MySound.4 if they exist
4) Restart Gladiator
Please keep in mind that it's a dirty hack. It could even crash Gladiator and i can't give any guarantee that it works. Furthermore the sounds are not properly stored with your songs/patches.
Markus