Thanks Hans,Toby,Nathan,I think I should be able to deal with this better 
now.
For those  who didn't quite get what I was trying to convey,I did send 
out a better explanation to Hans and Toby, which is given below.Thought 
it might be useful along with the solutions given by Hans,etc.in case 
someone else hits on the same problem.

>Actually, I think it's something to do with having to change attack and 
>release times,when one changes the speed at which the notes play,like 
>changing them from 16th notes at 75 bpm to say 
>32nd notes .Because the problem seems to go away if I shorten the attack 
>and release times .If I leave the values as they are,there's a lot of ugly 
>clicks if the notes go faster.
>
>So, I was wondering if I could get the orc to deal with this 
>automatically,so I could only enter one value in the score for ea. note 
>that would act like a velocity value (in addition to the duration value) 
>and the orc would adjust attack ,release ,and other envelope settings 
>intelligently.I had some ideas, but was looking for what others had to say 
>,in case I hadn't thought of something.


Cheers,
Drew