Some sounds do not work

Although the aircraft and ATC sounds are all working fine, a few effects files that have sounds associated to them, do not. Examples include a sonic boom (the Mach cloud appears but no sound at all), and a rumbling afterburner effect. The sounds have parameters outlined in the Effects files themselves; probably, FSX doesn't recognize the path. Wondering if anyone has had any success transplanting such sounds into FSX, or if there may be a simple coding change that might work.