Disklavier

Using the lap top with the S-YXG50 software synth and the CBX driver 
for serial to host:

It works!

But if I try to play both from the PC with a sequencer (cakewalk for 
example) assigning some tracks to port 1 and some to port 2, they 
are not in exact time synchrony.

The Disklavier has a delay of 500ms, is this exact?

The soft synth has a delay they call it latency and seems to be a 
function or the CPU speed.

This latency is not 500ms

Has any one a work around on this timing problem.

I can slide the events of the tracks in one of the ports, but witch 
one and how much in ticks.

Any reference to a page in the web is also appreciated.
Thanks