Additional information.
Unfortunately the site is in Japanese, but Steve talked about Roland products...
http://mnavi.roland.jp/works/200711_01.htmlhttp://mnavi.roland.jp/works/200711_02.htmlHe used SIMMONS as the first electronic drum, then in 1988 he used Roland OCTAPAD (PAD-8) during David's tour. During David's 2004 tour he used Roland HandSonic 15 (as well as Roland V-Kick Trigger KD-7), and Roland V-Drums for Ryuichi Sakamoto's 2005 tour.
The live photo in the middle of the first link is during Yukihiro Takahashi's Something Blue Tour in 2006 and he used Roland SPD-20.
For the World is Everything tour In 2007, he used SPD-S and KD-7 (as you can see at the bottom of the first link).
During the interview he tried HandSonic10 and gave a comment on it (the second link).