1. A system for processing user input on a device having an input subsystem including an input device, the subsystem adapted to output signals in response to a plurality of user inputs to the input device, the signals comprising information concerning the input, the device also having a regular output subsystem, the system comprising: low-latency subsystem adapted to receive signals from an input subsystem and to generate a low-latency response in response to one or more of the signals, and to send at least one of the signals to a regular output subsystem; wherein the signals received by the low-latency subsystem comprise an input which triggers a cross-control behavior, the low-latency subsystem makes an identification of the cross-control behavior, and the low-latency subsystem generates a low-latency response reflecting the cross-control behavior; and wherein the low-latency subsystem generates the low-latency response with low latency relative to the regular output subsystem.