the other day when I tested, I had sounds and everything. inbound to target... switched systems to Kh-66... hit "B" to arm or engage the missile, where upon I immediately got the radar "scanning" sound, as if I were using the R3R radar guided missile... at a certain distance to target, I started getting loud, clean, "locked" tone... I fired the missile... it tracked perfectly and boom goes the dynamite
yesterday, I tried it again to make sure it wasn't a fluke... same map, same loadout, same aircraft, same approach to the same target... this time, it didn't give me ANY sounds... after two passes with no radar or lock sounds... I came about for one last pass... this time, I made sure I had the kh-66 selected, and, using "B" again, I set the arming mode to "AUTO" and I watched the messages to the right of my screen. As soon as the message flashed up: "Kh-66 engaged"... I fired one missile, it tracked perfectly and boom and so forth...
so I have been able to get mine to work with and without sounds.. maybe your sounds are not playing but you are getting lock and just don't realize it? worth a shot id say. hope it helps..