Awesome, thanks so much for your help, especially showing a few alternatives on the exact file I want to change! I'll give all this a go. Hope it works. I really like the rj library and I'm keen to keep using it.

Hi, thanks for the reply. I passed on [vcf~] as it didn't have the sound I was after, it doesn't quite sound like a typical 12db/Oct resonant low pass filter to my ears, at least at higher cut off frequencies, and didn't think it was worth trying to wrangle a highpass filter out of it.

The heavy library can definitely do normal lists like [1 2 3( , it's specifically the [list] object that it doesn't like. In the patch in question, [list] has no arguments. Since posting this, I found http://write.flossmanuals.net/pure-data/lists/, and it says that [list] simply prepends a "list" symbol to any list it receives. If that's true then perhaps I can just do the same manually.

I have no idea why heavy does not have the [list] object, it's a strange omission / limitation

Hi, if I have a patch that contains [list], is there anything that I can substitute it with, that does exactly the same thing?

I've been having quite a bit of fun with the rj library (https://puredata.info/downloads/rjlib), but have found some patches like u_highpassq contain the use of [list] inside them. Normally this wouldn't be a problem, but I kind of need to be able to compile my patch using the heavy compiler (https://github.com/enzienaudio/hvcc), and the heavy compiler does not support [list] for some strange reason.

The reason I kind of need to use the heavy compiler is because that's what https://www.rebeltech.org/patch-library/ uses. I have one of their devices, and I want to load a patch onto it that contains the high pass filter mentioned previously.

Alternatively, if anyone knows of a good vanilla (not extended) resonant low pass / resonant high pass filter patch that I could use instead of the rj one then that'd be great. I'm surprised pd doesn't have something like this in vanilla by default. Thanks