Original sentence: Dampening curtains can be extended or retracted to ensure that the 'sound' of the space is perfectly matched to the scale and style of the music to be performed.It has concrete-walled reverberation chambers behind the orchestra and extending high along the sides, adding 50% to the hall's volume, which can be opened or closed
Edited sentence: Dampening panels can be extended or retracted to ensure that the 'sound' of the space is perfectly matched to the scale and style of the music to be performed.It has a reverberation chamber behind the orchestra and extending high along the sides, adding 50% to the hall's volume, the doors to which can be remotely opened or closed