If you are running a 3.7 copy of Flightgear, either pulled from Git or from a nightly build, your help is requested to test sound in the fly by view.
An issue may have been introduced by a change to Simgear on August 26th 2015. The symptom is that the aircraft sound in the fly by view is a constant pitch; it doesn't have the "Eeeeeeoooooowwwwmmmmm" sound produced by the Doppler effect. The problem may affect some users and not others, so your help is requested to assess who has a problem and who does not. On your next flight, all you have to do is switch to fly by view and listen to the sound.
If you are able to test, please provide the following information:
* Flightgear version, in particular the date it was updated, e.g. a nightly build date or date of Git pull
* Operating system and version, e.g. Ubuntu 15.04, Windows 10, Mac OS Yosemite
* Sound card make and model/chipset, e.g. NVIDIA Corporation MCP61
* Aircraft (it shouldn't make a difference but we may as well know it)
* Whether the Doppler effect is present
If you have a nightly build from before August 26th, it would also be useful to test with that version and then test a later version.