If you would recommend a video course for people who want to polish on their mixing skills, what would you suggest?
Personally, I tend to go for RSO’s stuff ( http://recordingschool.biz/homerecording/index.php ) if we’re talking videos. RSO even refers to Renoise as a DAW ( http://recordingschool.biz/homerecording/mixing-beginners-p-100.html ). Good stuff.
(For reading, I’d recommend the latest version of the book “Mixing Audio: Concepts, Practices and Tools” by Roey Izhaki.)