@Christoph-Hart
I'll figure it out. Seems like I still need to add paths somewhere for this kind of lib. Maybe xsimd should be on my external c++ hise feature requests wishlist haha...
some of my effects would really really benefit from cross-platform simd (useful for filterbanks, fast math approximations, simd for complex numbers, etc) from what i've read it makes a significant difference for more complex dsp, stuff that uses high cpu by nature, for example I'm trying to optimize a BBD chorus at the moment which uses 6% cpu when oversampled by 2x. Even with fast math approximations it's slow because of the 8 filter stages that all need to use complex math.