With the following disk.toc:
CD_ROM TRACK MODE1 DATAFILE "cdimage.raw" TRACK AUDIO FILE "drumnbass.wav" 0
was able to write a CD with 2 tracks, the first being data and the second being audio. The audio can be played on a CD. The CD can be mounted to read data. Swapping order on Mint (4.10.27) did not allow the CD to be mounted? Perhaps need newer kernel? But first audio track could be played okay.