The two IIR filters in juce

Juce has two IIR filters. IIRFilter and dsp::IIR::Filter. Any reason to use one over the other? dsp::IIR::Filter has getMagnitudeForFrequency which is nice. But it appears that every time you want to adjust the parameters you need to allocate a new set and replace them. This doesn’t seem usable inside a processing loop. So is there no way to smoothing adjust the freq and q?

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I asked for a possibility to adjust dsp::IIR:Coefficients in a non-allocating way approx a week ago… No answer so far though