I have 3 jacks, so I can get audio output from 2 sources, and audio input from another
On my mother board at the back panel I have 3 jacks3 Audio jacks: line-out, line-in and mic-in.
So I USE the back panel to connect speakers in to LINE-OUT jack
On the FRONT PANEL I have 2 Audio jacks: line-out, mic-in.
And use the front panel to connect HEADPHONES and MIC.