I can tune and capture any desired NAV/VOR signal and the instruments and autopilot can do there thing with the NAV/VOR signal.  

What I can't figure out is how to get an audio tone for the morse code VOR identifier.  I know which knob controls the volume but turning the knob does not make the audio morse signal audible.

I tried the standard FSX CTRL+1 to turn on/off the NAV 1 audio ident but that doesn't work either.

Is there a separate ON/OFF  switch for the NAV radio audio?  There is such a switch in many FSX AC but I can't find it in the CS 727.

I am having the same problem with NAV2 and both ADF devices.  They work fine - I just can't hear them.

Any suggestions?