In HL when I adjust the MP3 volume control in the audio settings it has no effect on the volume. This was tested by adjusting in the middle of playback as well as having a low volume set when the game loads.

However, the other volume controls do seem to have the desired effect on volume level, so this bug just affects the MP3 volume.

I am using pulseaudio.

Processor Information:
Vendor: GenuineIntel
Speed: 2668 Mhz
8 logical processors
4 physical processors
HyperThreading: Supported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Supported

Network Information:
Network Speed:

Operating System Version:
"Gentoo Base System release 2.1" (64 bit)
Kernel Name: Linux
Kernel Version: 3.6.11-gentoo
X Server vendor: The X.Org Foundation
X Server release: 11301000

Video Card:
Driver: NVIDIA Corporation GeForce GTX 295/PCIe/SSE2

Driver Version:  3.3.0 NVIDIA 313.18
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 60 Hz
VendorID:  0x10de
DeviceID:  0x5e0
Number of Monitors:  1
Number of Video Cards Not Detected
Primary Display Resolution:  1920 x 1080
Desktop Resolution: 1920 x 1080
Primary Display Size: 18.78" x 10.55"  (21.54" diag)
                                        47.7cm x 26.8cm  (54.7cm diag)
Primary Bus: PCI Express 16x
Primary VRAM: 896 MB
Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
Audio device:

Memory:
RAM: 5961 Mb

Miscellaneous:
UI Language: English
LANG: en_US.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 460352 Mb
Largest Free Hard Disk Block: 363074 Mb

Installed software:

Recent Failure Reports:
Tue Feb 5 18:14:35 2013 GMT: file ''/tmp/dumps/crash_20130205121433_1.dmp'', upload yes: ''CrashID=bp-26dd9342-96a7-4f1d-b5a4-0fd4e2130205''