Enable front audio panel on FreeBSD 12.0

When i plug headphones in, all i have is just a some noise. Rear panel is work fine. I have KDE 5 installed. Found some information in KMix below:
Screenshot_20200123_174108.png

Could it be hardware problem with 3.5 mm jack ports?
 
Please post the output from cat /dev/sndstat.

Could it be hardware problem with 3.5 mm jack ports?
Probably not. Looking at the screenshot I suspect you just need to switch the default audio output.
 
Code:
Installed devices:
pcm0: <NVIDIA GT220 (HDMI/DP 8ch)> (play)
pcm1: <NVIDIA GT220 (HDMI/DP 8ch)> (play)
pcm2: <NVIDIA GT220 (HDMI/DP 8ch)> (play)
pcm3: <NVIDIA GT220 (HDMI/DP 8ch)> (play)
pcm4: <Realtek ALC883 (Rear Analog 7.1/2.0)> (play/rec) default
pcm5: <Realtek ALC883 (Front Analog)> (play/rec)
pcm6: <Realtek ALC883 (Rear Digital)> (play)
No devices installed from userspace.

I'm see that rear is default. How could i switch?
 
# sysctl hw.snd.default_unit=n where n is the number of the sound device you want to use. In your case # sysctl hw.snd.default_unit=6
 
Is the front panel actually connected? On my system there's a cable running from the front panel to a connector on the mainboard. But to get this working correctly I had to rearrange the pins a bit (apparently the connector is not as standard as I thought is was).
 
It's okay now, but changes resets everytime after booting, so i'm need to use this command again.
 
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