Disklavier

I am driving my DC3A as well as other midi devices from SONAR 
(Cakewalk).  I understand that there is a 500ms delay (which can be 
turned on/off).  However, turning it off seems to make the 
Disklavier miss notes, etc.  What is the best way to sync my 
Disklavier with other midi devices?  I can move the notes/events of 
other midi devices, but this doesn't always seem to work, especially 
with tempo changes.  Help!  SJ