For anyone curious, this is a a recreation of the Nichols Electronics Digital II model of music box, which had a custom ordered chip inside with the tune arrangements composed by the son of one of the first music box manufacturers.
I've spent awhile pulling my hair out cause of the SVM chips because of how stupidly hard they were to emulate, but after a bunch of trial and error this is the closest I've gotten.
Now I can't wait to recreate the SVM (we assume cause it is in a epoxy blob with the chip info scratched off) chip in the original Digital.