Then you can apply whatever changes you want to make at once.
Once you have your piano roll open, punch in whatever you think you want to start off with.
Put 24 more hi-hats down except lower them one note B4.
The pros are so good because they know to take these concepts and turn them into something special and unique to their own sound.
Make sure that when you download this free trap hi-hat sample pack you unzip in your sound file bank.
Then for the other hats on B4, go from that halfway point until where the original velocity starts.