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Just a few months ago you couldn't buy a new additive synth; now you can pick from no less than three, and although they're from the same family, there are enough differences to make the choice less than straightforward Derek Johnson adds it all up.

Ten years after the K5, Kawai return to the technology which gave them the most successful implementation of additive synthesis ever, and include something of everything else they've learnt in the meantime. Paul Wiffen wonders if it all adds up...