I’d be into trying out the newer dsp::IIR::Filter option, because of its advantages, and (for now anyways) continuing to process sample-at-a-time.
This caveat gives me pause, however…
Moreover, you might need the function snapToZero after a few calls to avoid potential denormalisation issues.
The word “might” in particular - it makes it sound like some unknown factor might be introduced, and I don’t want to open a new can of worms at this point in the process.
EDIT: Poked around a bit and found this discussion re:snapToZero