Coming back to this after awhile… the built-in distortion is good to be aware of, but when you want to bring the filth, you kind of need it. Here’s VALadder getting nasty (sharing video just in case it isn’t fully appreciated how naughty these filters sound).
They’re a bit CPU-heavy (about 2.5% CPU per instance on my machine) but when you need dirt, RLPF just ain’t gonna cut it like this.
hjh