A computer system and associated computing device are provided which allow for the collection of user selections during playback of an audio file at a client computing device within a buffer period of a time window, calling a corresponding application responsive to the user selections to generate an output for a user based upon user-specific information, and changing the start and end times of the playback time window based upon user selections collected during the buffer period exceeding a threshold percentage of total user selections collected during the playback time window.