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...und (lowpass, 19 or 20 kHz cuttoff) PLS forward them. I'd like a 19kHz 'brick wall' cuttoff with no ripple in the passband. : ) >From my undergrad engineering work I vaguely remember about 'too steep a cutoff gives you a lot of ripple in the passband', and other such design homilies about RC filters. What I'm looking for here are some similar guides/rules of thumb for current digital filtering apps (AFsp, specifically). PS I tested myself as having an 18kHz cutoff a few years back and I thought of using this as my cutoff but I'll keep slightly higher for when frie...

please excuse me if this ones a basic error > y<-c(-0.7,-0.6,-0.5) > -0.7^1.22 [1] -0.6471718 > y^1.22 [1] NaN NaN NaN am I missing something important in my basic math?