CD Applications To Sequel 3 Audio

My friend and I have recorded basic songs on to a cd (not with Steinberg products). I run windows 8 OS, Roland UA-25X interface, A-800 Pro keyboard, and Sequel 3. I cannot record the cd onto an audio track on Sequel 3 so I can add drums or other virtual instruments. In fact although the song may be played on windows, but when sequel 3 is activated it shuts down the music. Is there any way I can get an audio track on to sequel 3 ? Thankyou for any help