From Toast 6's Help:
What Is a Mixed Mode CD?
A Mixed Mode CD contains one data track and one or more audio tracks, and is recorded in one session. You can play the audio or view the data on a computer.
Caution:
It is not recommended to play the audio portion of a Mixed Mode CD in a regular CD player.
Note:
Some older CD-ROM drives cannot recognize more than one session on a disc. A Mixed Mode CD may play on these types of drives while an Enhanced Audio CD may not.
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In Toast you can choose the Audio tab and the Mixed Mode option. I'm trying it now, but can't seem to see how to add data file info. Prolly user error.