An obvious question in hindsight (and after a bit of trial and error). Audacity is open source, and cubase is a professional studio application. The MR noise plugin demo will not work properly on the current stable version of audacity (1.2.3). I got some astounding results with cubase however. I’m aiming to secure a contract to digitize several thousand casettes for an organisation, and I think MR click and noise will be just the ticket for a demo for my work. Some of those tapes are pretty lousy.