Hello, We are planning to add AVS to some of our Hardware devices. In order to publish our product, we have to go through a product certification process. We were keen to know if there are any specific hardware requirements for the device to have apart from the core requirements as in the AVS design guidelines. We are planning to use the microphone and speaker via Bluetooth connectivity in our device and implement a GUI control to satisfy the needs for a physical control. As for the volume controller, does it necessarily have to be implemented as a physical switch or can be done for the same using the GUI control as well. I wish to know if it is feasible to do so. If not so, then what particular hardware modifications do we need to make in order to accomplish this.