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Apps mute and volume features work very unexpectedly with WASAPI disabled #16409

@XLTechie

Description

@XLTechie

Steps to reproduce:

  1. IN NVDA Advanced settings, set WASAPI to disabled.
  2. Apply, save config, and restart NVDA.
  3. Start some sound playing. I used Firefox, playing a video.
  4. Attempt to mute other apps (NVDA+Alt+Del).
  5. Attempt to change volume of other apps (NVDA+Alt+pgDn).
  6. Continue lowering volume of other apps to 20 or so.
  7. In NVDA Advanced settings, enable WASAPI.
  8. Save config and restart NVDA.

Actual behavior:

At step 4, NVDA says:

Sound split cannot be used. Please enable WASAPI in the Advanced category in NVDA Settings to use it.
Applications muted

First,. I was not trying to use Sound Split. Why is it being mentioned?
Second, Applications have not been muted, so the message is false.

At step 5, NVDA says:

Sound split cannot be used. Please enable WASAPI in the Advanced category in NVDA Settings to use it.
Applications volume 95

First, I was not using Sound Split, again.
Second, the application volume was not changed, so the message is false.

At step 8:

Upon NVDA restart, the volume of the other application--which was previously not changed--suddenly drops precipitously to match the volume that was set while WASAPI was disabled.

Expected behavior:

At step 4, NVDA should speak only something like:

Application mute is only supported when WASAPI is enabled in NVDA advanced settings.

At step 5, NVDA should speak only something like:

Application volume changes are only supported when WASAPI is enabled in NVDA advanced settings.

At step 8, the volume should not change on NVDA startup, because step 4 should not have changed any volume in configuration.

NVDA logs, crash dumps and other attachments:

System configuration

NVDA installed/portable/running from source:

Portable.

NVDA version:

alpha-31622,11a2b4f1

Windows version:

11 HOME 23H3

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

N/A

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

N/A

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

No.

If NVDA add-ons are disabled, is your problem still occurring?

Yes.

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Of course.

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    bug/regressionp3https://github.com/nvaccess/nvda/blob/master/projectDocs/issues/triage.md#prioritytriagedHas been triaged, issue is waiting for implementation.

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