Windows, apparently, has a built-in audio ducking feature which is very annoying (to me at least). When two or more audio sources are playing and the maximum audio volume exceeds 100% the OS applies a limiter instead of clipping the audio. It has nothing to do with the Communications settings (Right Click Speaker Icon -> Sounds -> Communications tab) in case you think it is. Windows XP won't do that. I didn't test it on Vista.
32 Answers
Windows 7 solution
Right click on your volume control, then pick your playback devices tab. Right click on your speakers, then choose "Enhancements". In the scroll bar area, check "Loudness Equalization".
1type 'mmsys.cpl' in the search bar to bring up the Windows Sound Control Panel - that's where the 'Playback' tab is -> click on 'Enhancements' and you'll see the 'Loudness Equalization' option
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