Released in North America as “Etrian Odyssey Untold, Unseen, Unheard,” this combo mini-artbook and mini-soundtrack was shipped with the 3DS game. The game itself is a beefed-up remake of the very first Etrian Odyssey game; the game now features life-like music a la Etrian Odyssey IV, as well as a character-driven story (also like EO4…).
None of these seven tracks are found, in their present form, on the official OST. Per the Japanese soundtrack name, these are “rough sketch” recordings. They give you an idea of what Yuzo Koshiro was working up to as he developed the soundtrack for the game. This music reminds us that brilliance rarely happens on the first try: it takes time to refine, to balance, to test and check.
What this means, however, is that you’re probably not going to find yourself enjoying these “rough” versions. I didn’t, anyway. The only track I really got into was the short “live recording” opening. The rough sketch opening had a lot more content, but yeah, it’s rough. It’s a synth stand-in/placeholder for the real deal.
My advice? Hunt down the full Shin Sekaiju MeiQ OST. If you bought the game and got this bonus CD, it’s a nice extra trinket to have, but I suspect it will leave you wanting more. I know that it, alongside playing the game, had that exact effect on me.