Abstract: Improved techniques to control utilization of accessory devices with electronic devices are disclosed. The improved techniques can use cryptographic approaches to authenticate electronic devices, namely, electronic devices that interconnect and communicate with one another. One aspect pertains to techniques for authenticating an electronic device, such as an accessory device. Another aspect pertains to provisioning software features (e.g., functions) by or for an electronic device (e.g., a host device). Different electronic devices can, for example, be provisioned differently depending on different degrees or levels of authentication, or depending on manufacturer or product basis. Still another aspect pertains to using an accessory (or adapter) to convert a peripheral device (e.g., USB device) into a host device (e.g., USB host). The improved techniques are particularly well suited for electronic devices, such as media devices, that can receive accessory devices.

Abstract: An electronic apparatus, such as an electronic mixing apparatus and an electronic keyboard apparatus, and associated methods are disclosed. The electronic mixing apparatus or the electronic keyboard apparatus is provided on a touch screen that provides user input and display capabilities. In one embodiment, the touch screen is a multipoint touch screen so that multiple user touch inputs can be simultaneously acquired. In another embodiment, surface guides can be provided on the touch screen to assist with user input.