Melody and chords in the same instrument?

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So I just made some chords using a synth and found it could even be used for a melody. The I just copied the top notes in the every chord and pasted it up an octave. Then I just edited them into a sort of mini chord progression(a melody) and it sounds pretty great. And it got me thinking, do we always need the melody in a different instrument? :-)
Of course not. For hundreds of years people have been playing complete tunes, melody and harmony both, on things like harpsichords, guitars, pianos, harps etc. No reason it can't work with synths too.

Steve
It's nice to keep them separate so you put them in different mixing channels and help you keep more organized. If you really like a instrument for more than one thing you could always hit the gear button and clone the track so you can put it in different mixing channels and rename them for organization.