Original sentence: At least one side of the box is constructed from horizontal or vertical palettes known as louvres or swell shades, which operate in a similar way to Venetian blinds; their position can be adjusted from the console.When the louvres are open, more sound is heard than when they are closed
Edited sentence: At least one side of the box is constructed from horizontal or vertical palettes known as swell shades, which operate in a similar way to Venetian blinds; their position can be adjusted from the console.When the swell shades are open, more sound is heard than when they are closed