despite being able to (for the most part) hit the right notes, they still don't sound as good as I would like.
Why DOESN'T it sound the way you want it to? Is it because you are concentrating on the notes and fingerings? Just trying to get through the piece? Even though demanding pieces/passages require lots of energy, it should be fairly comfortable to play, meaning that you are relaxed and your hands are kind of on "automatic pilot."
I don't mean you are detached from the piece and just going through the motions, although, that kind of IS how it should be. Not that you aren't in control, but as your hands are going through the motions, LISTEN to the sounds that you are making, and don't judge the sounds that have already happened, just experience the music. This is assuming that you've already analyzed the piece in terms of form and harmonic structure, allowing you to see where it should push and pull and where climaxes are, etc.
Obviously, this is easier to do with pieces that you can manage easily, so I DO think you should try some pieces that are a little less difficult. Once you can play them naturally, comfortably, and relaxed, then you shouldn't have a problem controlling the sound.
Be sure to "disect" the piece. Just focus on one passage, phrase, or maybe even a few notes at a time, experimenting with how many ways you can make it sound. Go to extremes: if you want a slight crescendo, make it pp to ff. If you want a staccato, see how many different ways you can play it short: sharp, light, just detached, . . . .
Not that you will play a slight cresc as pp to ff, but just see what you have to choose from. Realizing the spectrum of sounds that you can create should help open it up for you =)
I think it was Chopin that told his students make 20 different sounds with a single note!
I agree with Bernhard: if it's too difficult, then you should avoid it because you will definitely not be able to have it sound like you want it to.
I also agree with teresa_b: "see" or feel your own emotional state. Pretend you are composing the piece, and as you play a passage, decide exactly when and how to play each note. What do you want to "say" with the music? If a passage should sound sad, then you can't just play it sad, you should actually BE sad, don't you think? So think of something that makes you sad as you play it. I find this extremely helpful for me. I get carried away in the music and forget that I'm actually making the music.
Am I crazy? lol
Good Luck
