Hi there and welcome
Due to its age the manual was never digitized and as such is not available for download. You have to purchase a paper copy which you can from my link below
To answer your question on if you can play songs through it, you can via the microphone port, you need a stereo male to male cable, one end you plug into the headphone port of your laptop and the other into the Microphone input port on the back of the unit.
You can get this cable here
If you would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.