iPad & iPhone DJ Controllers
Most devices will be supplied with free dj mixing software, alternatively will be compatible with affordable apps via the apple iTunes store. Once you have installed the relevant app simply connect the device and you will have access to mix your MP3s with features such as scratching, EQ, FX. A lot of DJ kit made for the iPad will have a built in audio interface suitable to connect to your PA system or active studio monitors, as well as cueing via your headphones, otherwise you can also connect your speakers via the built in 3.5mm mini jack output directly on the iOS device.
Many DJ Controllers will work for both PC, Mac and for iPad, for instance on the Pioneer DDJ Wego 2, you can make use of the included free virtual DJ software on your PC, and also use it with the DeeJay appfor iPad.
Aside from all-in-one DJ controollers DJ Tech Direct also sells iPod Mixers meaning you can plug your iPod oriPhone into a dock in the mixer and use a combination of CD Decks, Vinyl and and access all the music stored on your device.