Hello. If anyone experienced the problem of loosing sound from, the MiG-17s and F-86K, after installing the MiG-21s and Jet War 1.3. I changed the Buttons file from 10.3 back to 10.0 ( Stable buttons ) for 4.101 DBW 1.71. Now all aircraft sounds work, no more freezes or crashes. The only problems I have now is when the MiG-21s are installed in FMB as stationary aircraft, I get warnings ( shift + tab key) " to clear VBuff# so and so, and clear IBuff# so and so". The missions will lock up. When the Stationary 21s are removed and replaced with other stationary MiGs- 15 to 17, the mission will work properly, sounds included. Same problem with stationary MiG-19, only in some missions. Another item causing conflict is the two part radar antenna , items #171 and 172 in DBW objects ( VBuff and IBuff ) warnings as mentioned above. In some missions I still get by with the antennas. I hope this helps anyone who experienced this problem. Solved by reading read me messages on this forum. Thank you.