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So basically it is for portability. Most people who do sound design, or produce electronic music don't necessarily need an entire 88 key keyboard because they are often not playing more than one part at a time and recording it into a piece of software (Like Ableton or Cubase). As you are recording tracks you might just need a couple of octaves at a time to play chord progressions or melodies.

Your DJ friend could be using the keys to trigger effects, or samples or any number of things. Keyboard with only a couple of octaves and no internal sounds are generally called 'Controllers' because that is exactly what they are for; controlling either other instruments, or parameters in the DJ or production software.

Personally, I like to have a full sized keyboard because I am 'slightly' better at playing than most EDM people you run into, so I actually like to play left and right hand at once when I'm hashing out ideas. But I am a bit space constrained at the moment!

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