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What annoys me a little about the SEM filter is that there must be a weird thing going about the resonance, is that up to something like 85% of its range there is not much going on, and past that 85% (of the resonance range) it starts to accumulate very quickly. Makes it difficult to predict the modulation in this one, because if you have an LFO and you modulate the cutoff inversely with the resonance at 85% nothing happens unless some drastic modulation is applied. It can get tricky to adjust, if someone manages to get it right it sounds beautiful but it's easy to loose the sweet spot.
I don't know if the original SEM behaved this way. I have read someplace that the first VCF has a weird behaviour with regard to feedback, which is to be expected given the resonace weirdness, so maybe it's something to do with the design of the ASIC.
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