It is used to release the track to the audience.
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If you mean a USB DJ Mixer, then try some of the freeware DJ programs such as: VIRTUAL DJ; CROSSDJ FREE; CUTEDJ. there are others as well.
Call yourself DJ mixer
mixer is when you ix the music only but he dj amp i for all the gear like speakers mixers turntables and stuff.............
You'll know how to change it if you're a technician in the electronic range, plus you have the tools needed. If not, please bring it to the specialists who can do that job.
The most economically successful DJ mixer in the DC area is Pioneer DJM-700. It has a four channel mixer and it is available at a price of 89 dollars.
Depending on the Mixer itself, you might hook it up to a multiple of things. DJ mixers are usually connected to 1 or more sources of sound. In most DJing set-ups, these imput items would be turntables or CD players. Depending on the amount of "inputs" the mixer has, you can add a variety of sources. On the "out" connection, the mixer is generally plugged into an amplifier so you will be able to hear the sound that is produced. You might also have a CD burner, PC, or other items connected to your "out" plugs.
To seamlessly blend two tracks together on your DJ controller, adjust the pitch fader to match the BPM (beats per minute) of both tracks. Move the pitch fader up or down slightly until the beats of the two tracks align, creating a smooth transition between them.
An open source dj mixer is a totally free-of-charge means of editing and controlling the inputs and outputs of audio (and sometimes video) programs.
The Behringer DX626 Pro DJ Mixer Factory B-Stock can cost around $79.00 new. It's a good brand and fairly reasonibly priced.
There are some equipment recommended for a beginner DJ. The most important include DJ turntables, DJ cartridges, DJ mixer, slipmats, DJ headphones, RCA cables, etc.
There are many apps that can do this task for the Ipod. Such as, DJ Mixer pro, iRig MIX, and more like it. You can find more apps like this by searching it in the Apple store.