Abstract: Embodiments of the invention is directed to a manufacturing process to mold and cast custom softening polymers into complex shaped devices, said process comprising the steps of: creating a 3D mold or shell; injecting the shell with a polymer or pre-polymer; cooling or curing the polymer in a short period of time; and forming a device.

Abstract: The present disclosure relates, according to some embodiments, to devices, systems, and methods for modifying received and/or perceived sound. For example, a device for altering sound received at a subject's ear may comprise an elongated earpiece having a proximal portion and a distal portion and defining a longitudinal axis (e.g., together defining a longitudinal axis). A proximal portion may comprise an insert configured for at least partial insertion in the canal of the subject's ear. A distal end may comprise a handle configured to guide insertion of the insert in the subject's ear canal.