I'm playing your hack and it looks great.
However for some reason, the music of the game is the classic one, and not your new ogg files.
I tried searching an option to enable alternate audio in Mesen, but could'n find anything.
Do you know how I can fix it?.
I'm running Mesen 0.9.5 under Win 10 x64.
Thanks a lot.
EDIT: It seems I had a wrong version of the ROM. I just fixed it. Thanks again.