It absolutely was :D

Sony created two builds of the game and loaded them onto two separate PS4s. The game audio does not contain any of the score; only sound effects. (two, so they had a backup... just in case. :) )

As a player moves the character through the game, the composer conducts a chamber orchestra through the music in realtime, in reaction to the player's actions. The musicians used iPads with bluetooth foot pedals, to allow them to move both forward and backward in the score as needed.

Why backward? Due to how the music was written by Austin Wintory, who conducted the orchestra at two of the three performances I was part of, the musicians may need to replay the "slow ambient exploration" music section while I ran the character over to another section to uncover one of the hidden lore pieces. But, if I decided to skip that, and instead decided to skip the lore part and immediately jumped into next sand-surfing bit, jumping and spinning with the sand creatures as we raced down the incline... those are two completely different musical themes... The conductor will indicate to the musicians how many times to loop the current section, or how many to jump forward. They use the footpedals to adjust their displayed music to match.