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There's nothing magic in the CEM3372. Some other CEM chips also support pole switching. Some, like the CEM3378/79 don't do it as easily. Better leave them for spares for the good old stuff like Chroma Polaris and such. If you want to see pole mixing done with readily available components you could take a look at the 4 Pole Mission Shruthi. The Ambika didn't realize a full version of that due to component count/cost, but it can certainly be done.