Advertised in this month's Science Focus - no view as to whether it's a good idea or not, but upgrading your ears is a new one on me...
Calmer®
An earplug alternative to reduce stress and calm your everyday sound. Soothe sound sensitivities and noise related stress. Perfect for sensitive hearing, autism, hyperacusis, misophonia and other sensory processing conditions.
www.flareaudio.com