As someone who liked this genre before his joints started getting creaky, I see why this and the thing it was clearly trying to kill off (Reflecbeat) didn't make it.
There is probably something insane going on under the hood but it it's not being conveyed well because of the lack of video out and also they don't think to explain it.
Also having thought on it further, most those music tracks kind of sucked. Like I'm not asking the game to cater to me, just have variety in its soundtrack.
That was a dozen or so songs and it was like, "Come on down to Synchronica, we got: generic rhythm game song, Vocaloid, [put in third thing later-editor]!"