Select sound output in FreeBSD

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There are times that you need to select your prefered sound output 
for your FreeBSD system. Typical options are one of the anlog rear
or front jacks or HDMI to feed audio to a TV or screen.
The selection of the output should be done before you run the
application that will play the sound. 

Review which are the installed devices(options)
% cat /dev/sndstat
pcm0: <ATI R6xx (HDMI)> (play)
pcm1: <ATI R6xx (HDMI)> (play)
pcm2: <Realtek ALC892 (Rear Analog)> (play/rec) default
pcm3: <Realtek ALC892 (Front Analog)> (playi/rec)

Set your prefered device
# sysctl hw.snd.default_unit=0

Start the prefered application and enjoy sound through the HDMI.

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