Peak 6.1.1 works wonderful on my new MacMini, but I can not use my older Waves plugins again. So all users will be warned, before upgrading, if your audio plugins will work after that.
Investigating the Waves homepage told me why my Waves plugins don't work:
Peak 6 needs wave shell 6 and the plugins version 6.x.
On the other hand, if you use wave shell 5.9.7 or 6.0 you could use older Waves plugins 4.1.2 using Garage Band as host application (or some other applications). Thats very interesting to me!
Because I have many older waves plugins I had to pay much money for upgrades.
It will be very interesting if my old plugins will work with another host application, e.g. Amadeus Pro or Apple Soundtrack Pro!!!!
This combination of Peak and Waves plugins upgrading over the years is too much expensive for most hobbyists! I'm unsure if I would upgrade Peak again in the future....!