Oh hai there Keoni ;) And sorry b00daw for the late reply.
It seems to me that the song runs slower on a real PAL system than on Stella with NTSC settings. Whether that's due to faulty emulation, a quirk in the code, or my simply imagination, I don't know.
No idea how Slocum's kernal looks on PAL hw either. Can it possibly look any more fucked up than normal? :p Keoni, if you want to give it a try, code and test binary are here