2 sound outputs?

I don't know if this should go in the sound section or not, so I put it here. Mods feel free to move it if it should be there.
Hey all...I have an NF7 mobo, using the onboard sound. I have my stereo connected to it via a 3.5mm-to-RCA jack. I have the stereo on the green sound jack, and my headphone on the blue one. Is it possible to have sound output on both jacks? How do I go about doing that?

Check the driver settings. Most onboard sound drivers allow you to swap or customize outputs in some way.

If you don't find any you could just buy a splitter.

hmmm...I tried checking my audio settings & properties and changing a few things around, but nothing I tried works.