nnirror/facet

Remove filter ringing artifacts present in first ~second of filtered audio

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The filter's impulse response is creating audible artifacts as it settles into steady-state behavior. I think it should be possible to prevent this by appending a second of silence in front of the audio prior to filtering, then removing the silence after processing. But it might be tricky to implement correctly because filters can have FacetPatterns as arguments, which are matched to the input data size, etc.

Fixed in: f4a4dc1