I was rooting through the archives of the Data East sound team homepage when I came across
this page listing some members of Gamadelic over the years. Of interest is that a few of their profiles have Data East e-mail addresses that include their real names:
MARO eventually has
yoshida@dataeast-corp.co.jp, and
Koremasa has de-sound02.
iwasaki@nifty.ne.jp. SIN's e-mail address is de-sound03.
yamazaki@nifty.ne.jp, but I haven't the foggiest who that could be.