The Ketron SD2 has been very well received by users of many music software applications. Here are are some random forum posts and comments.

Cakewalk tm  http://forum.cakewalk.com/tm.asp?m=1429160

CuBase tm http://forum.cubase.net/phpbb2/viewtopic.php?t=99700

v.i. control forum  http://vi-control.net/forum/viewtopic.php?t=9682

PG Music (Band in A Box)  http://www.pgmusic.com

NorthernSounds http://www.northernsounds.com/forum/

Harmony Central http://reviews.harmony-central.com/reviews