1. A method, comprising: generating, by a first device, an audio signal; generating, by the first device, a control signal that is configured to control a haptic feedback device that is incorporated into a device for delivering audio based on the audio signal to a user, wherein the device for delivering audio with the incorporated haptic feedback device is separate from the first device; embedding the control signal in the audio signal by using a pseudorandom signal to form an encoded audio signal, wherein the encoded audio signal combines the control signal and the audio signal into one signal; and sending the encoded audio signal from the first device through an audio communication channel to the device for delivering audio; wherein the embedding the control signal in the audio signal by using a pseudorandom signal to form an encoded audio signal comprises: generating the encoded audio signal to be equal to a signal that is at least partly based on the audio signal plus a product of the control signal and an inverse of the pseudorandom signal.