My bad. Just checked the number, and it's actually a dual 1GHz, 2002 Quicksilver. If Apple supplied some models with dual 5.5" bays, it's time to go shopping.
I do have Toast installed in the Applications folder. With only one drive one inserts the disc to be copied, selects the tracks to be copied and selects record. Toast then creates a temporary file, ejects the disc, and asks that you insert a blank disc. What I hope to do is avoid the disc-changing step, so I can go do something else and return to find a completed copy. I have three Apple DVD drives available.
I do have an older external CD burner, but I wish to avoid using USB to transfer music data.