Yamaha DTXpress/DTXplorer/DTXtreme

hi all!

I have some questions about midi connections and dtxpress. 
When I connect dtxpress to my pc (os:win2000) via "to host" cable, 
after I hit a pad, there is always a little delay before I hear a 
sound. 
It becomes very annoying when I try to edit (midi) drums over an 
audio file. Midi sound is heard after a delay and it is impossible to 
synchronize with the audio file while playing. Can anybody help me 
with this?

My next question is also midi related and somehow connected with the 
previous one:
I bought a midi controller keyboard (yamaha cbx-k1) to record bass 
and other partitions. I am using dtxpress sounds (dtxpress brain in 
other words :)) as the sound module. My problem is, I cannot control 
dtxpress sounds from midi controller. I can change patches with the 
help of a program such as cubase or voyetra recorder, however, I 
cannot change patches directly from keyboard. 
(delay problem is doubled when I connected midi controller to 
dtxpress via normal midi cable while dtxpress was still connected to 
my pc via "to host" cable)

You can email me directly if you have a solution for me. Thank you in 
advance for your help. (a reference to a document is also welcome)

Regards

Cem