Loudness Hyperacusis

The main goal of this clinical trial is to evaluate the effectiveness, benefits, and post-treatment persistence of an intervention for loudness hyperacusis in adults with autism spectrum disorder (ASD). The main questions it aims to answer are: * Does the intervention increase loudness tolerance * Does the intervention reduce symptoms related to loudness hyperacusis Researchers will compare measures related to loudness hyperacusis before, during, and after the intervention. Participants will: * Be randomly assigned to either one of two groups. One group will receiver the intervention immediately. This group will be evaluated during the 6-month intervention and evaluated for 6 months after the end of the intervention. The other group will be evaluated for 6 months before the intervention and during the 6-month intervention. * Visit the test site once every month over the course of a year for evaluation and intervention activities * Keep a diary of their symptoms and the number of hours per day they engage in the intervention