Correct me if I'm wrong but I think he explained the Attack and Decay part of the ADSR backwards. (Approx 15:56 in the time line.) I believe the Decay is how long it takes to drop down to the Sustained level before the Release. He says it correctly further on in the video.
Over all great tutorial. I don't play keys but I do use hardware and software synth a bit.


Does the noise in your head bother me ?