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Question: I don't understand how in Reaper 768pt sinc is considered very slow but R8Brain is fast. Isn't the expensive part of resampling the convolution with the filter kernel? What can R8Brain possibly be doing that differs so much from a simple windowed sinc? Is it just the method of convolution, direct vs FFT?
Asked by Erin (75.15.159.x) on January 21 2023, 5:09am
Reply on January 21 2023, 5:25am:
    IIRC r8brain does big FFT AA filters plus a smaller size sinc interpolation, vs the 768pt sinc filter which is a combination of sinc interpolation and AA filtering, which is brute force. One advantage of 768pt sinc is lower latency if you're using it on FX.

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