How to make tecno

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I have omnisphere and alchemy .when doing the atmosphere can I put the key note of the track and choose a preset for it?it would be easy for me and would be sure the atmosphere is in key …

Yeah it should be in key for most presets although if a particular presets is using an inbuilt chord it might not. br
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Really for techno you can get away with a bit of dissonance do almost anything should work. Just choose something you think sounds cool.