Max MSP is a programming language for audio, I last used it in 2016 and even then barely, I've never needed to but a job came in and I wasn't able to do in Reaper or Ableton. Basically built a bespoke plugin for an art installation. It's seriously hurt my head! I'm not in anyway a code/programmer! Fingers crossed it holds up, once installed it's running for 2 months straight.