Nobody will answer you because....
There are no details!
Please edit post with details of;
1. pc system (speed/ram)
2. soundcard (brand/model)
3. software used (which midi sequencer)
take care,
Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76