A method and system for enabling dynamic user interactivity between user actions and actions to be performed by a computer program is provided. The system includes a computing system and an acoustic detection analyzer that is coupled to or executed by the computing system. The system also includes an input device for interfacing with the computer program that is to be executed by the computing system. The input device has a gearing control for establishing a scaling between acoustic data produced at the input device and actions to be applied by the computer program as analyzed by the acoustic detection analyzer. The gearing can be set dynamically by the game, by the user, or can be preset by software or user configured in accordance with a gearing algorithm.