KORG 1600D audio export

[ZORGLUB]

Hello,

Thats my first message on this forum.
I made several recording with my KORG D1600 recorder.
I created several "songs". Now I would like to export these songs in a current audio format.
Reading the user manual I undertsood (maybe wrong) that I had to merge the track 1-16 on track 1-2. I did so.Then I cliked ons WRITE CD in the SONG window. The writing seemed to be completed.
So now I have some doubts.
1 - May I complele the CD with another SONG without scratching the previous one?
2 _ Once these writing done how tocreate audio files one per SONG?