The above is taken from a workshop performance; some small modifications to the cello part in the 2nd movement have been made to facilitate security of tuning.
Note on Performance
Each of the two movements consists of a freely-performed solo part superimposed upon a duo, who play together in strict time. Precise relationships between the instruments are indicated in boxed text. A full description of the interaction between instruments is given here:
In movement I), the cello & piano begin first, playing together in strict time; after a few seconds, the alto flute begins playing freely in a separate tempo. When the cello & piano have finished, the alto flute is asked to continue playing freely for a short time (approximately 3/4 phrases). The alto flute should begin in the background, gradually coming to the fore, before being left to play alone at the end of the movement.
In movement II), the alto flute & cello begin first, playing together in strict time; after a few seconds the piano begins, playing freely in a separate tempo. The piano should remain in the background throughout, playing alone for a short time at the end of the movement.