Ultra Toukon Densetsu

This game uses a custom variant of the Seta 1
arcade hardware that includes an extra YM3438
chip in addition to the custom X1-010 PCM chip.

At the moment of writing, the YM3438 clock in
MAME is incorrect. The game uses the FM timers
to control the music tempo, so the current 4MHz
clock in MAME causes the music to play
ridiculously slowly and at a lower octave. I
have logged this pack with a fixed build of
MAME that sets the clock to 8 MHz, which I
think sounds much better and should be more
accurate to the original PCB.

— ctr