PowerISO Dreamcast ADX Removal?

I’m tyring to remove the background music from a game using PowerISO and have finally found the ADX files that need to be removed!

But now i don’t know how to remove them and recreate the CDI without them.

I had to mount the image in order to obtain these files but you can’t delete data from a mounted file.

When i tried opening the CDI non mounted it just says file not supported.
Any suggestions?

I could really use some help here. Not sure how many dreamcast heads exist up in here but yeah!

Thanks