How can I get mpd to control system volume with soft mixer

[r0b0tl0ve]

So, on my previous system (debian) I was able to control the volume for all applications using mpd. For example,

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mpd volume 45

would set the volume for everything to 45%. Now, on mageia, setting

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mpd volume 45

sets the volume at 45% of the system volume for mpd only. This means, playing a youtube video results in very loud sound, since it is set at the system volume. I would like for everything to play at the same sound level, simultaniously.

So, to summerize, I would like to know how to:

configure my system so that

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mpd volume 45

changes volume globally, not just for mpd

configure my system so that multiple sources can be played simultaniously

I currently have item 2 taken care of, with plug:dmix set for "device" in "output" for mpd.conf. Item 1, however, baffles me, and no amount of googling or experimentation seems to have lead me to a solution so far.