dmix works but aliased dmixer does not

[m27315 <m27315@xxxxxxxxx>]

Hello,

I have a simple, functional .asoundrc file, which directs all out output directly to "dmix".  This good .asoundrc file contains:

pcm.!default {
    type plug
    slave.pcm "dmix"
}
pcm.dsp0 {
    type plug
    slave.pcm "dmix"
}
ctl.mixer0 {
    type hw
    card 0
}

Using this, I can "aplay" sounds very easily.  If I try to make a simple alias of dmix, call it dmixer, I get the following errors in aplay:

ALSA lib pcm_direct.c:980:(snd1_pcm_direct_initialize_slave) unable to install hw params
ALSA lib pcm_dmix.c:1030:(snd_pcm_dmix_open) unable to initialize slave
aplay: main:660: audio open error: Resource temporarily unavailable

This second .asoundrc file looks like:

pcm.dmixed {
    type dmix
    ipc_key 313
    slave.pcm "hw:0"
}
pcm.!default {
    type plug
    slave.pcm "dmixed"
}
pcm.dsp0 {
    type plug
    slave.pcm "dmixed"
}
ctl.mixer0 {
    type hw
    card 0
}

What is the functional difference between these two .asoundrc files? Why does the first one work and the second one does not?

Many thanks!

Trevor

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