Lynn, I have a suggestion to add a new configuration section (Configure->Sounds) to allow the user to select individual sounds for individual program events that currently trigger the default sounds.
I would be highly interested in this feature, too. Using a Kenwood TH D 72 both as GPSr and Transceiver I get regular dropouts of the GPS fix obviously because both parts use the same port for communication. So for me it would be very nice to assign no sounds to the GPS Locked / GPS Lost signal.
As workaround I adjust the windows sounds in general untill another solution is hopefully available.