I'm quite new to pd so I'm totally in over my head right now.

I have a simple patch that computes a 8192 sample FFT from the [adc~] thats smoothed using a hann window: audio.pd

I have an audio-rate signal of the 8192 FFT coming out and now what I want to do is pull out the amplitude of a specific frequency during each buffer.

I tried looking into [delread~] and [delwrite~] but that doesn't appear to do what I want.

In the end, what want to do is recreate this audio visualization I made using p5.js with pg and Gem.

Given the nyquist frequency is 44100 Hz / 2 = 22050 Hz, I can get the amplitude for a specific frequency by getting sample of the buffer at the round(freq / 22050 * 8192) index.

Anyways, I hope that makes sense. Thanks for any help!

I see. So the hot-cold, left-right right ordering is more integral to pd than I realized. I suppose it makes sense from a technical perspective, but it means there's more to think about! Thanks a lot for the response. This really clarified some things for me.

Hey there, I recall from the tutorial that pd uses depth-first when triggering signals and thats what [trigger] is for. Well I'm trying to read keyboard input and I'm piecing together a message that gets passed to [route] but I'm having all kinds of trouble.

When I press a key using this patch, the keydown parameter is late. That is the first message is "shift 0" and the second message is "shift 1".

The next thing I tried is to use trigger on the right (cold) input to pack. However, now I'm receiving duplicate messages. I get "shift 0" "shift 1" when pressing and then "shift 1", "shift 0" when I let go.

A pragmatic solution that seems to work is simply reordering things and using the message box to select the other elements.

This works as expected. The result is "shift 1", "shift 0".

But I'm still a bit confused. I'd imagine that in a more complicated program, this sort of refactoring might not be possible. Or it might be hard to find or debug. So I'm wondering, is there a way to get this all to work without switching the order of the arguments going into pack?

Thanks!