Frontpanel sound
By default, the pins labeled LINE OUT_R/BLINE_OUT_R and the pins LINE OUT_L/BLINE_OUT_L are shortened with jumper caps. You should remove the caps ONLY when you are connecting the front audio cable. So, if you are going to use the back panel, you should short the pins mentioned earlier. You cannot use the back panel and the front panel at the same time. If you want to use your headphones using the back panel, short the mentioned pins and connect your headphones to the green header of your back panel audio. If you want to use the front panel, take off the jumper caps and connect the front panel cable. Remember, if you connect the front panel audio cable, you won't be able to use the back panel. If you are going to use the back panel, don't forget to return the jumper caps. Usually the 5-6 and 9-10 pins. Hope this helps.
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