SSD4 issue with midi

Hope someone hear might be able to shed some light on this. I've got a roland TD11 kit I come from the midi out using the M-Audio UNO to the USB port on my PC. Now my issue is strange when I play the Roland just as a stand alone kit the hi hat triggers normally but when I play the roland as a VI via pro tools Steven Slate drums it seems like something can't keep up when to play 16th's on the Hi Hat it seems to miss a few. Anyone experienced this or know how to solve this. Is it the midi UNO do you think. I've watched fast drummers on the net using SSD4 and a roland kit and theirs always sounds good. This has stumped me :confused:



Thanks in advance :-)