To use these drivers, make sure that you have loaded the emu10kx kernel
module, by doing
# kldload snd_emu10kx
or adding
snd_emu10kx_load="YES"
to your /boot/loader.conf (normally done automatically when installing
the port).
Note you should disable loading of the emu10k1 driver (this driver is for
the same hardware).
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