There's an article in Wired magazine about the Trance Vibrator. Having used it myself (not the same way Game Girl did), i've gotta say that it's a nifty device. In just about any other game it would be totally gimmicky, but in Rez, where the rhythm is part of the experience, it's pretty cool and further's your immersion.
Insert Credit posted a graphic of
Mahoro (search the page for "Mahoro") using the vibrator. "Buru Buru" indeed...