A first sequence of states associated with a surviving path and a second sequence of states associated with a non-surviving path are determined. The device comprises an airway pressure supply device and a controller for controlling the airway pressure of the airway pressure supply device. , on a loom as part of a real-time manufacturing process. The second processor is coupled to the first processor and performs a second part of the advanced audio distribution profile source encoding. The paint roller also includes a handle assembly. One or both of the echo cancellers may be implemented using closed-form solutions, including a closed form solution for a hybrid method in the frequency domain.