Answer: aleatoric

AnswerCrossword Clue
aleatoricdepending on a contingent event
aleatoricemploying the element of chance in the choice of tones, rests, durations, rhythms, dynamics, etc.
aleatoricof or pertaining to accidental causes; of luck or chance; unpredictable
aleatoricdependent on chance, luck, or an uncertain outcome also ALEATORY