How do I change my Asus Xonar soundcard audiochannels to 5.1?

[Noricksan]

I do have a Xonar AE Asus soundcart on a Win11/64 PC running. When I play a simple stereo sound I only hear the sound on the front speaker. 

How can I change the setting in order to hear the sound on ALL audio channels (front, rear, etc) ? The soundcard is set to 5.1 already but has no effect.

Thanks for the answers!

[MasterC]

The content you play has to be decoded in surround sound. Generally music is recorded in stereo only. Some games offer true 5.1 / 7.1 surround sound (as opposed to virtual). Try playing a movie (using an appropriate player).