I suspected as much, I even looked a bit for something to decompile them but really have no desire to spend a whole lot of time learning to code gauges so I can figure out the sounds they use.  I have looked at some of the xml code and agree I could likely wade thru it and ID the sounds they use - but I am pretty sure the sound in question is a uncommon one used in a C gauge. I am also aware that FSsound.dll might cure some problems - I have also seen a utility/application posted on AVSIM that claims to somehow patch FS to work even if it does not find all the sounds rather than to freak out, but I am leary and testing it here won't tell me anything anyway.  Any other help here would be appreciated as I am holding a update and put any future postings of my panels on hold until I can assure they will work on machines other than me own...