[webber]

so i assume that discjuggler is not working for you so you need the next best thing

since you got an audio and iso this is what you do

use winoncd to burn the audio making sure that it is done in multisession.
once you burn the audio you have to check the LBA to verify that it is the same LBA that was reported by cdirip for the second session typically it is 11700, now some burners don't allow you to burn these types of sectors so you have to cut two sectors off of the audio track, now you should do the first burn with a cdrw (for the audio) then verify the LBA value using cdrecord , if the LBA does match then you can burn the second session if it is not the same you will get a coaster.
once all is fine then burn the second session using winoncd or cdrecord for the iso,
depending on the media that you use you may get a faint thin line of seperation between the first burn and the second burn, sometimes the disc may not work again it depends on the media that you are using.

this above mentioned method does work i have used it but it is a run around as opposed to using dj3,
so it is totally up to you

if you are confused post it and i will give you more details

regards
webber