Peter van Dam

Hi, I am a new switch user and I don't seem to understand how to create audio CDs. I have a couple of .mp3 and .cda files that I would like to put on one audio CD. How do I do that? What software do I need? I noticed that Express Burn will not accept .cda files and Switch does not convert .cda files to .mp3. What't the catch? TIA, -peter