The Softube Saturation Knob is a great plug-in but previously only available via Avid or PreSonus, now Softube have set the beast free and you can now download it in AAX, RTAS, VST2, VST and AU completely free and without having to sign up. Softube write;
As of today, Softube’s Saturation Knob is available as a free download. It can be used in any VST, Audio Units or AAX host—and also as a Rack Extension in Propellerheads Reason—on both Mac and Windows platforms. You’re welcome.
The Saturation Knob has previously been available exclusively for Presonus Studio One and Pro Tools users, but today we make it available for users of other DAWs as well. For VST, AAX and Audio Units, Saturation Knob is part of the installer package, which includes all Softube plug-ins.
No iLok is required for using the Saturation Knob. For any of the other Softube plug-ins in the installer package, iLok owners can download 20 day demonstration licenses.