Logic Pro 9 How to make a pure beat?

#1
Dear Logic fans

I need to create a pure beat but i am not able to.

if you want to know what I mean, select ultrabeat and play kick 2 (default setting) it gives a strange noise after the beat. kick 1 is better but still have that noise after the beat when I decrease the decay of envelope 4 the noise becomes more obvious and I can not find the right function to remove the noise. I am just looking forward to have a pure beat
can you guys helo me with that?
 
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