This track is 140bpm, with acid trance / atmospheric techno influences, a banging rhythm that contrasts with the subtle and ethereal sound design, featuring squelchy acid 303 synth and a lo-fi/dreamy vibe. The main “synthesizer” used in this is not actually a synth, but a timestretched recording of the artist himself playing the eponymous Étude no. 4 with him flute.