TL;DW: Limit or wipe out the highest frequencies, near the Nyquist frequency.
Sometimes I just get lucky :)
This plugin is just the anti-aliasing technology I was experimenting with in 2010, applied to Slew, my simple slew clipper. I thought it was going to make the slightly grungy Slew smoother (Slew is a clipper, and can be expected to have clipper-like qualities). That anti-aliasing code was a bit odd. It’s possible I made a mistake somewhere.
If so, I’m keeping it, and now what I invented is out for VST also, and free to all.
Slew2 doesn’t act anything like Slew. What it does, is it puts a particular behavior on the extreme highs. Set to an intermediate value, it’s an acceleration limiter. Cranked all the way up… well, check out the video. It behaves like one of the nodes in Average (also coming to VST) with a 100% cancellation, but the point of total cancellation is also the Nyquist frequency. Slew2 produces a very natural-sounding brickwall filter exactly at that frequency, with the response falling off faster and faster until it’s totally gone when you hit the Nyquist limit (digital sampling theory: at 44.1K (CD quality) it is 22.05K where the treble cuts off).
People are using this for de-essers, and it’s pretty much ideal for any sound that must not be overwhelming in the super highs. The peculiar character of the rolloff means it’s suitable for almost anything because it won’t affect lower treble, and the fact that it’s really a clipper means you can use the slider to set a threshold where, the harder you push Slew2, the more it’ll refuse to let more brightness through. I’ve not tried using it as an acceleration limiter on a mastering lathe, but it could probably do that: which also means if you’re going for classic analog tone, you can just toss this on the 2-buss and use just enough to take excess brightness away. Slew2 is one of the ‘secret weapon’ plugins I was specifically asked to port to VST, and I’m happy to bring it to you all.
Still doing the Patreon, without which I will be one poor and hungry DSP nerd. Please support it and encourage others to support it, because I have a lot of plugins still to come. It’s already 11 plugins in just a few months, and there are many more, not even counting new inventions in the works.