WebRTC - Automatic Gain Control behaves weird

[Geenz]

Environment

Second Life Release 7.2.1.17108480561 (64bit)
Release Notes

You are at 50.5, 94.1, 22.7 in webRTC2 located at simhost-0462d668818ec3f3b.aditi
SLURL: secondlife://Aditi/secondlife/webRTC2/51/94/23
(global coordinates 260,147.0, 245,342.0, 22.7)
WebRTC-Voice 2025-08-21.17114312399
Release Notes

CPU: AMD Ryzen 9 9950X3D 16-Core Processor (4299.92 MHz)
Memory: 95890 MB
OS Version: Microsoft Windows 11 64-bit (Build 26100.4946)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: NVIDIA GeForce RTX 5090/PCIe/SSE2

Windows Graphics Driver Version: 32.0.15.8115
OpenGL Version: 4.6.0 NVIDIA 581.15

Window size: 2558x1360
Font Size Adjustment: 96pt
UI Scaling: 1
Draw distance: 256m
Bandwidth: 3000kbit/s
LOD factor: 2
Render quality: 6
Texture memory: 32607MB
Disk cache: Max size 2150.4 MB (100.0% used)

J2C Decoder Version: KDU v7.10.4
Audio Driver Version: OpenAL, version 1.1 ALSOFT 1.24.2 / OpenAL Community / OpenAL Soft: OpenAL Soft
Dullahan: 1.14.0.202408091639
CEF: 118.4.1+g3dd6078+chromium-118.0.5993.54
Chromium: 118.0.5993.54
LibVLC Version: 3.0.21
Voice Server Version: Secondlife WebRTC Gateway

Packets Lost: 0/4,848 (0.0%)
September 05 2025 15:29:59

Description

Note: this appears to be the case in the latest test build as well.

Doesn't seem to matter if you enable or disable AGC - we have some weird behavior here.

Reproduction steps

1. Login to a WebRTC region
2. Stand next to a listener and make some noise in spacial voice while doing the following;
3. Set the Mic volume slider to Max in Preferences > Sound & Media > Voice Input/Output devices
4. The listener hears no difference until you Toggle the Speak button off and on (#4796), so do that.
5. Listener, note the volume
6. Untick the Automatic Gain Control option in Preferences > Sound & Media
7. Toggle the Speak button off and on
8. Listener, compare the volume

Observed: There is no perceived volume difference with AGC on or off.

Expected: AGC should attenuate a high volume, and amplify a low volume.

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[Dan-Linden]

Reopened.
Tested on Second Life Release 7.2.2.18145557091 on Win11/OSX in the scope of https://github.com/secondlife/iqa/issues/554