1. Apparatus for delivering pressurized gas to the airway of a patient, said apparatus comprising: gas flow generator means for providing a flow of said gas; patient interface means for sealingly communicating with the airway of a patient; first conduit means for delivery of said gas flow to the airway of a patient, said first conduit means; comprising a first conduit having a first end connected to said gas flow generator means and a second end connected to said patient interface means; sensor means in fluid communication with said first conduit and located substantially at said gas flow generator means for detecting conditions corresponding to breathing patterns of a patient and generating signals corresponding to said conditions; second conduit means for communicating said conditions to said sensor means, said second conduit means comprising a second conduit having one end communicating with said sensor means and an opposite end communicating with said first conduit and located substantially at said gas flow generator means, said second conduit communicating with said first conduit substantially at said first end of said first conduit, said second conduit being acoustically tuned to optimally transmit sound frequencies falling within a range which is known to be associated with upper airway obstructions; information processing means for receiving said signals and for controlling the output of said gas flow generator means responsive to said signals.