Methods and systems for a multimedia queue management solution that maintaining graceful Quality of Experience degradation are provided. Mechanisms for computing the instantaneous angular position and apparatus for collocating encoder devices in close proximity to the CD rotation motor are disclosed. Reach characteristic data is collected from a patient using the balance assessment apparatus, and the reach characteristic data is analyzed to determine whether the patient has a balance deficit. The interface module is mechanically attached to the base module and electrically connected thereto.