Why do programs change the volume of main channels?

Why do programs modify the volume of the system themselves and not just of their own "channel" similar to in windows? The only programs I found that do this are quakelive and the flash plugin.
The fact these programs do do this means it it possible, so why is it not the standard?
It is quite annoying to have to raise the volume of my system just because I turned down the sound in mplayer or mp3blaster or some other application. Is there any easy fix for this?

lucke wrote:
josh000 wrote:I don't want to draw comparisons, but windows and mac have had this basic ability for at least the last 10 years.
Didn't system per-app volume control, akin to the one provided by pulseaudio, appear only in Vista?
For whatever it is worth, I use pulseaudio only for that functionality.
No, Vista included separate mixers for each application.
Programs have had independent volume control since 95, and quite possible since 3.1
You could make a movie player have lower volume than say, a game or song playing, while having one volume control for the system. In vista beyond you have separate volume controls for each application, regardless of if the application allows it or not.

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