Source games turn down my volume every time i load a new instance

My problem is exactly that. When ever i load a new level in a source it turns down the volume of the game and music and various other applications. Its not a huge deal with me as its a minor problem but fixing it would be nice too. Here's my specs for help.


Mainboard : MICRO-STAR INTERNATIONAL CO.,LTD 790FX-GD70(MS-7577)
Chipset : AMD 790FX
Processor : AMD Phenom II X4 945e @ 3000 MHz
Physical Memory : 6144 MB (3 x 2048 DDR3-SDRAM )
Video Card : ATI Radeon HD 5700 Series
Hard Disk : OCZ-ONYX (32 GB)
Hard Disk : WDC (1000 GB)
CD-Rom Drive : HL-DT-ST CD-RW GCE-8481B ATA Device
Monitor Type : P235H - 23 inches
Network Card : RTL8168/8111 PCIe Gigabit Ethernet Adapter
Network Card : RTL8168/8111 PCIe Gigabit Ethernet Adapter
Network Card : RT2800 802.11n Wireless LAN Card
Operating System : Windows 7 Ultimate Professional 6.01.7600 (x64)
DirectX : Version 11.00
Windows Performance Index : 1.0 on 7.9



Device Audio : Creative Labs EMU10K2 Audio Chipset (SB Audigy Series)
Device Audio : ATI Technologies SB600 High Definition Audio Controller
Device Audio : ATI Technologies EG JUNIPER XT Audio Device [Radeon HD 5700 Series]
Audio Playback : Sound Card (Creative SB Audigy
Audio Playback : Digital Audio (S/PDIF) (High De
Audio Playback : SPDIF Out (Creative SB Audigy 2
Audio Playback : Microsoft Sound Mapper
Audio Recording : Microphone (High Definition Aud
Audio Recording : "What U Hear" (Creative SB Audi
Audio Recording : S/PDIF-In (Creative SB Audigy 2
Audio Recording : Microphone (Creative SB Audigy
MIDI Output : Microsoft GS Wavetable Synth
MIDI Output : SB Audigy 2 ZS Synth A [E800]
MIDI Output : SB Audigy 2 ZS Synth B [E800]
MIDI Output : SB Audigy 2 ZS MIDI IO [E800]
MIDI Output : Microsoft MIDI Mapper
MIDI Input : SB Audigy 2 ZS MIDI IO [E800]
Mixer Device : Sound Card (Creative SB Audigy
Mixer Device : Digital Audio (S/PDIF) (High De
Mixer Device : SPDIF Out (Creative SB Audigy 2
Mixer Device : "What U Hear" (Creative SB Audi
Mixer Device : Microphone (High Definition Aud
Mixer Device : S/PDIF-In (Creative SB Audigy 2
Mixer Device : Microphone (Creative SB Audigy
Device multimedia : AVIVideo
Device multimedia : CDAudio
Device multimedia : Sequencer
Device multimedia : WaveAudio
Device multimedia : MPEGVideo
Audio Compression : Microsoft IMA ADPCM CODEC
Audio Compression : Microsoft CCITT G.711 A-Law and u-Law CODEC
Audio Compression : Microsoft GSM 6.10 Audio CODEC
Audio Compression : Microsoft ADPCM CODEC
Audio Compression : Fraunhofer IIS MPEG Layer-3 Codec (decode only)
Audio Compression : Ogg Vorbis Audio CODEC
Audio Compression : Messenger Audio Codec
Audio Compression : Decode AC3 and DTS audio
Audio Compression : Microsoft PCM Converter
Video Compression : Microsoft RLE
Video Compression : Microsoft Video 1
Video Compression : Microsoft YUV
Video Compression : Microsoft YUV
Video Compression : Microsoft YUV
Video Compression : Intel IYUV codec
Video Compression : Intel IYUV codec
Video Compression : Toshiba YUV Codec
Video Compression : Cinepak Codec by Radius
Video Compression : Fraps Video Decompressor
Video Compression : Xvid MPEG-4 Codec
Video Compression : DivX 6.9.2 Codec (4 Logical CPUs)
Video Compression : DivX 6.9.2 YV12 Decoder
Video Compression : Indeo® video 5.10