Hello all,
So, lop~ attenuates the frequencies above the cutoff frequency, but it does not really take away that much. I always thought that lo pass filters were more cutoff filters and not attenuating filters.

Anyway, I linked a number of lop~ filters together on audio with the same cutoff frequency which did attenuate the frequencies above the cutoff more so. Is there a more elegant way to do this? Is there a patch?

Lastly, is there a reason the lop~ does not cutoff frequencies above the set frequency?

This all applies to hip~ as well.

It should be more accurate to chain [filter~] as demonstrated by Thomas Musil in [lp8_cheb~] from the iemlib library........ I think.......
That should give as close as possible to a brickwall filter. [lp9_cheb~] too, but it is even more expensive.

As usual, @katjav is a great learning source for all things FIR........ http://www.katjaas.nl/FFTwindow/FFTwindow&filtering.html
David.

Thank you. This does seem close to what I want.

It is not working because the |filter~| does not exist in my library. Which library is that from?

I tried the link to www.katjaas.nl/ website but I get this:

403 Forbidden
Request forbidden by administrative rules.

If you don't mind using externals, I think there is a brick-wall filter in ELSE.

Thanks. Where do I get ELSE? I do not mind using externals.

@raynovich If you are using windows then I can upload the filter dll's. It is in the iemlib library as well (in extended) and just the dll might nor be enough though..... unsure.

Strange reply from katjaas site.
It's plain html....... so......?
Your IP must have been blacklisted for her server at some point.
You should be able to access it through a proxy.
Try searching with https://www.startpage.com/
and when it finds her site click "proxy" rather than accessing it directly.
David.

@raynovich Go to Help --> Find Externals and search for "ELSE".

All of this has helped. Thank you so much.