There is a problem with Pure Data patch "3.8.1.1. rfft array" on this page.

When I run the patch, I get a second peak off the edge of the graph, as you can see in the attached image. I'm using Pd 0.55.0. Is this a problem with the patch or with Pure Data? What's the fix?

@jamcultur I bet the examples are out-of-date, e.g. ch 1.2 of that tutorial says "This tutorial assumes Pd-extended version 0.39 or higher." That was a little while ago!

I was able to fix things by opening up the properties of the magnitude table, changing the size to 32 (which makes more sense than the given value of 100 if it's a real FFT in a default 64 sample block), and saving the patch again. Looking at the before and after using a text editor and you can see that the array declarations are somewhat different.

@jameslo Thanks! That works better.