Hi,

Reported on Twitter and subsequently confirmed:

Steps to reproduce:

With Windows 10 Version 2004 (May 2020 Update) installed, open NVDA's synthesizer dialog (Control+NVDA+S). Then see which devices are listed under output device combo box.

Actual behavior:

An empty string is displayed at the top.

Expected behavior:

A default output device name (such as Microsoft Sound Mapper) is shown.

System configuration

NVDA installed/portable/running from source:

Installed and portable

NVDA version:

2020.1, 2020.2 beta 2, alpha-20514

Windows version:

Windows 10 Version 20H2 beta (build 19042.330)

Name and version of other software in use when reproducing the issue:

None

Other information about your system:

Multiple sound devices present (internal sound card, wireless headset)

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

Versions listed above exhibit the same problem

If addons are disabled, is your problem still occurring?

Yes

Did you try to run the COM registry fixing tool in NVDA menu / tools?

Not applicable

Additional context:

This issue occurs in Version 2004 and later (Version 1909 did return the correct name for the first selected output device). This suggests something going on with device capabilities functions found in winmm.dll which are used to build output device names.

Thanks.