I love this piece! Unfortunately, it's very difficult, and can really tie the hands in knots with all the key blocks and such.If I understand what you refer to, what I do with the bottom staff is play the notes with stems upward with the right hand, stems downward with the left. For example, in measures 3-4, I hit the b with my left fifth finger, the g flat and f with the fifth and fourth fingers of the right hand, continuing the chromatic scale with the first 2 fingers.
Is this the only Ligeti etude you're working on? I might suggest to you to learn all of book 1, as the six etudes work together in performance almost like one extended piece. You have the fast desordre, the beautiful cordes a vide, touches bloquees, fanfares (which is a very fun piece!), the slightly jazzy arc-en-ciel, with automne a varsovie providing a big finale.
Pierre-Laurent Aimard is the ONLY way to go. Don't just take my word for it, take Ligeti's word for it too. Aimard is Ligeti's favorite pianist, the one who knows the most about his work.
I agree totallyI got Biret's recording and I regretted so much.Aimard and Libetta are the only 2 people in this world can play Ligeti like the way it should be played.