So the blog of the percussionist Inohaya that I linked in my post from last year only has one post, which says that he moved to a Jimdo site, takmix.jimdo.com. It's unfortunately defunct now. Oh no!
Hey but interesting thing, someone with the curious name of 猪早タクミ contributed to
doujin circle DDBY's album RelaxTime. DDBY's page links him to takmix.jimdo.com. So there's your doujin connection. Also, to make things totally and completely obvious, Tomoya Koga played guitar on his piece.
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While I'm here,
game's sound team: Keisuke Tsukahara, Fumio Itoh, Yasuhiro Takagi, Naoyuki Machida, Shinichi Goto, Tomoya Koga. I'm not going to link them all as the "AM2 Sound Team" arrangers because I'm quite certain they're not all arrangers, Naoyuki Machida (recording engineer) and Tomoya Koga (only a guitarist for SEGA at this point in his career) in particular. AM2 does this lump "sound" credit a lot and it's really annoying.