Micing hi hats on a drum set isn't as easy as it first seems to be. In particular this is very true, if you don't have a sophisticated microphone at your hands, which can do a proper job. 1st. you have to keep in mind, that the proximity between the hi hat and other instruments like the snare drum can cause a lot of trouble. Most times you will experience a lot of snare bleed in your hi hat recordings if doing it wrong. Good hi hat microphones have a supercardioid sound pattern so that sounds from the rear are eliminated as much as possible and bleed becomes a minor issue. When micing hi hats and using a supercardioid microphone, you should aim the microphone capsule towards the hi hat cymbals and away from other instruments to avoid the bleeding effect.