1. ------- make iso image.
% mkisofs -R -J -o ./blah.img .

2. ------- mount to check.
root# vnconfig -c vn0 ./blah.img
root# mount_cd9660 /dev/vn0c /cdrom
root# ls /cdrom

3. ------- unmount.
root# cd /
root# umount /cdrom
root# vnconfig -u vn0

4. ------- burn cd
root# burncd -s 4 -f /dev/acd0c data blah.img fixate

burn Audio.

root# burncd -v -f /dev/acd0c -s 4 blah0.wav blah1.wav audio
or 
root# burncd -v -n -f /dev/acd0c -s 4 blah0.wav blah1.wav audio
(my cd-r drive can not use "n" option. )