Sound of Violence

Sound of Violence is a 2021 Finnish-American slasher film written and directed by Alex Noyer in his directorial debut, inspired by his short film Conductor. The film stars Jasmin Savoy Brown as a formerly deaf girl who goes on a killing spree after witnessing the murder of her family. The film was released on May 21, 2021 by Gravitas Ventures after its world premiere on March 19, 2021 at the SXSW Film Festival.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.