Questions about my Daraku Tenshi PCB (plus question on adapter)

[DarakuTenshi]

Less than a year after I finished my Hyperspin cab, I'm now working on my 4th real arcade game... little did I know that one of them would actually be a Daraku Tenshi game. A game that holds a special place in my heart will soon hold a special place in my home arcade. This is also my first Jamma arcade game... sort of. I have a 2 Slot MVS cab, but from what I've heard I can't just plug my DT board into the Jamma harness as I could blow my sound.

Well here we go:
1. Can I plug this into my MVS cab? If so will it need modification?
2. Does anyone know what this adapter is for? (It came with my PCB)



And just because here is the whole board.


And just because I'm excited I post this picture.