i spoke with john last night and did a test with the spearhead maps for allied assault, if you put the amb_stereo folder inside the pk3 file unfortuanately it doesnt work, they have to be situated in the mohaa main sound folder in the amb_stereo folder, something i remember seeing on the sfx forum a while back is that spearhead and breakthrough use stereo wav files and possibly mp3 aswell if i remember correctly, where as allied assault sounds are just mono wav files, the real man to speak to about that is Gold from sfx i know he has done quite a lot of stuff with sounds and getting them working in allied assault, i hope the little info i have given you here helps