Spatialized audio is inaudible

[Zee2]

This issue has been migrated a new MRTK repository, and the status of this issue will now be tracked at the following location:

• Spatialized audio is inaudible MixedRealityToolkit/MixedRealityToolkit-Unity#237

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Describe the bug

In my own (non-Template project) I'm encountering a bug when I try to set up my audio using the Microsoft Spatializer. When an audio source is set up for spatialization, it simply does not play any audio.

To reproduce

Steps to reproduce the behavior:

1. Install Microsoft Spatializer
2. Select Microsoft Spatializer as the desired spatializer in the project settings
3. Add an audio source to a GameObject
4. Configure audio source to spatialize. Set Spatial 3D blend to 100%
5. Play an audio clip with PlayOneShot

Observe that no audio is audible, on HoloLens 2 or on Windows with spatial audio enabled.

Expected behavior

You should hear something, at least

Your setup (please complete the following information)

• MRTK pre.12
• Unity 2021.3.1

Target platform (please complete the following information)

• HoloLens 2
• Windows

Additional context

The setup instructions were followed from here: https://learn.microsoft.com/en-us/windows/mixed-reality/develop/unity/spatial-sound-in-unity

[srinjoym]

Issue: Audio mixer is not set to the Master Audio Mixer on PressableButton's from MRTK when using the Spatializer plugin. We should find the first audio mixer in the project and set it automatically, or show a warning

[AMollis]

@marlenaklein-msft there are 5 issues related to spatial audio, Can you help provide more context on these issues, and resolve any duplicates?

The spatial audio issues area:

1. MRTK should use the new Microsoft Spatializer with hardware offload support #6897
2. Update audio demos and spatializer settings #10744
3. [MRTK3] Non-Canvas Buttons: Audio spatializer warning messages + decreasing volume on multiple press #10979
4. Spatialized audio is inaudible #11176
5. Spatialized audio on UX buttons eventually is inaudible after several presses #11177

[marlenaklein-msft]

Closing this and consolidating spatial audio bugs into three issues:
Add Warning for Missing Audio Mixer (Spatial Audio)
Updating Sample Scenes with Mixer for Spatial Audio
Documentation for Spatial Audio