The 1CD version of Broken Sword 1 (and 2) came out in game magazine Level. I discovered that if you want to compress audio for ScummVM with their tools, it fails.
I haven't used it since 2005 so I have no idea if and how it works anymore :)
I think BS2 utility was working ok or it includes both resource files. Here's fixed utility source and modified ScummVM engine to support loading this combined for BS1: