dmix/software mixing doesn't work

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So I've been trying to fix this problem for a while now, but I can't seem to
set up ALSA in a way to enable multiple sound sources at once (2 or more
apps/programs to use the soundcard simultaneously). Despite having a dmix
entry in /etc/asound.conf, it still refuses to work the way I intend it to.
And speaking of which, here's how my asound.conf looks like:

_____________________________________________________________________________

    pcm.!default {
        type hw
        card PCH
    }

    ctl.!default {
        type hw
        card PCH
    }


    pcm.dsp {
        type plug
        slave.pcm "dmix"
    }

defaults.pcm.rate_converter "speexrate_medium"

____________________________________________________________________________


And here's what 'aplay -l' gives me:

____________________________________________________________________________

    **** List of PLAYBACK Hardware Devices ****
    card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 1: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
      Subdevices: 1/1
      Subdevice #0: subdevice #0

____________________________________________________________________________

As you probably guessed, I'm using an integrated soundcard (that's on a
Intel B85 chipset), and I've set it to use the jack plug output instead of
the HDMI one.

Another issue that I'm having is that the sounds/music/etc that are supposed
to be outputted by Firefox, don't get played at all (like for example
add-ons that notify me when I get an e-mail, or HTML5 audio and/or video
players, or other such stuff). Curiously the flash player seems to be
unaffected by this issue, probably because it's stand-alone to the browser
itself.

Does anyone know a potential fix for this? 

Somebody over on the Debian forums (which is my distro of choice) said that
I should remove the dmix section from the config file since he/she doesn't
need it and he/she can play sounds from multiple sources. I tried that but
it hasn't changed anything...


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