What happens when you get an orchestra to IMPROVISE?

Lots to digest here! What is the correct word and pronunciation for this. I’d recommend the original Steve Reich and musicians recording of this masterpiece: Our small strings library: ...and the big sister (that we combined for the Music For 18 remix!): If you want to try aleatoric sampling for free download R&D strings free as part of our “VAULTS“ program... ...oh and what is HYSTERESIS???: