I'm hearing a strange audio problem on Memento Mori. As the stained glass window screen scrolls into place, just as it switches from 24 char rows to 25, the music glitches.. as though it repeats the same sound for a couple of frames? This doesn't happen on a real C64...
You can hear the problem on a recording that I made: https://youtu.be/0yVHATuNido .. it happens sometime around the 3m55s mark.