I found a way to get it running.

I have the eXoDOS collection and it includes the CD version of the game - I only have the floppies. Floppy versions are also what you'll find on abandonia, etc...

I extracted the file MELODIC.BNK from the ISO and dropped it into the directory on the Pi. I set SOUND.exe to Sound Blaster 16 Asp A220, I7, D1. Then I ran DL.exe. It works perfectly.

Exited back to Emulation Station and ran DL directly from the menu. Ran through a quick preset "Balanced", configured my two gamepads for the battles and sent my fire demon after a water demon. I dun kilt him ded!! Everything works perfectly.

BTW - this also worked with my laptop install too. So nice.