Same problem. I tryed to copy dll, change all as wrotten in sound.ini file, but - no sound in cocpit. Sys is a Win 7 X64. I think, give up. It`s impossible to fix that problem, and as i see, that bug is not only a 727 - it`s a serail bug for all of Capitan Sim product`s, and is no a difference what a version number of aircraft you have...