Abstract: The invention relates to a portable storage media (1) comprising resources and metadata wherein the portable storage media (1) further comprises a representation file representing the resources, the metadata and their interrelationships. The invention further relates to a Host device (2) that is designed to cooperate with at least one portable storage media (1), which portable storage media (1) comprises resources and metadata wherein the portable storage media (1) further comprises a representation file representing the resources, the metadata and their interrelationships, and wherein the host device (2) comprises evaluating means that are designed for evaluating the representation file to provide a Content Directory Service of the stored resources.

Abstract: To control the sound output of various devices (1a, 1b, 1c, . . . ) a control unit (3) gathers information (I) on the sound output of the devices. Before a device starts producing sound, it submits a request (R) to the control unit. In response to the request, the control unit allocates a sound share (S) to the device on the basis of the sound information, the sound share involving a maximum volume. Thus the volume of any new sound is determined by the volume of the existing sound. An optional priority schedule may allow existing sound to be reduced in volume.