Easiest way to do additive synthesis in Logic?

I want to be able to create pure combinations of sine waves,
like
sin(A x) + 3 sin(2A x) + 1.4 sin(3A x)
Is there an easy way to do that in Logic?

Sampleconstruct wrote:
The state of the Art additive synthesis synth is Alchemy by Camel Audio. Besides that you can produce sine waves with quite a few of Logic's onboard synths, but real additive synthesis and the ability to resynth samples with it by importing Audio files and resynthesizing those with sinewaves (or any other synthetic wave) can not be done. So check this out and demo Alchemy:
Let me clarify. I don't need the state of the art. I only need to combine a
sine wave and a few harmonics. This is for a one time demo. If a synth can
mix a sine wave and a couple of harmonics and vary the amplitudes of these,
that's all I need.

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