I have a gizmo between my pc and my pa system. Mine is a Presonus AudioBox that is no longer in production. They have others. Another popular brand is Focusrite and I am sure there are other manufacturers.

I plug the PA system into the Presonus then plug the Presonus into a USB port on my desktop. (No reason why it won't work on a laptop.) The PC sees the Presonus and I can then choose between onboard sound or the Presonus.

The sound is amazing.

Plus I can plug in a guitar or keyboard if I wish to do so. My unit has 2 jacks (XLR or 1/4 inch). Larger units are available.

...Deb