Boy oh boy, what do we have over here... A fix patch that finally makes the Saturn Doom port much better, even if only slightly! Gone is the horribly low-pitched tone of all sound effects, corrected to match that of the PSX port/D64. Fireball explosions now have their original sound effect restored, instead of confusingly retaining the rocket/barrel explosion sound effect. The main menu now plays its own song like the PSX port as well. Other audio tweaks, which I don't really notice (because I'm an emulator guy), also exist, most probably easier to notice if you're on the console.
Although still barely noticeable, game speed is slightly faster at less complicated areas, so it's not all slideshow fest. Since this patch is meant for the Japanese release, it might be worth noting that this is a nod to an old urban myth that the Japanese release was faster than the US/Europe release. A pretty good one at that, even if still rather preliminary.
5/5 Does exactly what it says it fixes. Let's see if we can get another update that fixes other stuff, such as the height at which Doomguy makes his notable grunt noise and a firing speed adjustment in the not-too distant future. (Patch version is 0.1 as of when this was written.)