I recently found this simulator after going to RoBo Style today. I saw a few videos of him playing on another sim other than Feeling Pomu and Step'n Music. It's called Nanasi Groove. However, from playing a few songs, I actually like it. I can't provide a whole lot of information since I just got it and it's completely in Japanese. Eh, my opnions on it so far, which you don't have to agree with. Don't bash on me for them, okay?
Pros......it's a pretty good simulator so far. It's a bit more on the Feeling Pomu side with animations, but actually has some nice background music to it. The songs provided in the two packs were actually pretty fun and challenging. However, if you have an ASC, I'm pretty sure it can work with it. Robo used it in his videos. Keysounds are love. <3
Cons......first of all, it was hard to actually set it up. Seriously would take some time to get the song packs since there's alot. The program being in Japanese totally threw me off. It took me several times to actually understand how to set up the options and load the songs before I could play. There's no feeling whatsoever of Pop'n Music in terms of looks or songs. So far, I couldn't find any Pop'n Music originals to play on this. I didn't test out the ones I use for Feeling Pomu though. It might work. Just to let you know, no characters.
If anyone's still interested, here are the links
Nanasi Groove download page Toy Musical Main Page Toy Musical Song pack downloads
Okay, that's all the info I have.....