Sorry if it might sound a bit of trivial to some of you peeps..I don't get what the author wants to say with this:
" To represent the amplitude envelope,we will continue to use the waveform view,but now we "zoom out" to look at changes in amplitude at the timescale of the note(I also don't know if he still means the duration of the note by using the word "timescale"?) "
He also mentions in a figure that the "zoom out" from individual cycles of a waveform is used to see the amplitude envelope.
Thanks for your attention!