one thing i learned today about playing an instrument is that you can't force emotion with technique
i was having a problem with creating a dreamy texture on the violin while doing portato (for chopin's nocturne) and i was having such a hard time at the lesson cuz i knew i had to lighten up my bow. i knew my fingers had to stay strong. i knew i had to be relaxed. but my bow still shook like crazy and my portato was harsh and bumpy. but then i decided to listen to the piece and play it no matter what technique i had. i wanted to play it for the emotions chopin made it, and all of a sudden that dreamy portato section was a lot better.
so technique hints at and describes emotion, but knowing what the feeling and sound of the piece is what truly creates the emotion.
i suspect that if you have the emotion, you have the technique as well