ive found that you can go to limewire, or ares, and other downloading programs for different sound fx such as gun shots, or DJ sounds. Also you can but sound fx CD's that will include such sounds. or if you go to a website where it requires you to buy such a sound, you can always if it lets you stream the sound effect, record the sound with audacity. but most people for the sound effects when making beats have to update there sounds, by getting sound cd's with samples loops and sound effects. you can always record it your self by using multiple tracks and recording it, but unless you have better editing equipment this probably wont give you the same desired effect.