Yeah, polyphase should surely give you better quality, but the Bessel filter is probably less CPU costly (I hope so anyway). I use 6 consecutive 4th order Bessel filters with 64x oversampling to suppress aliases on naive waveforms, with virtually no audible aliasing. Then again, polyphase might also work just as well in my specific case, but I haven't been able to really wrap my head around it yet.
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