Western free reed instruments such as the accordion and the harmonica do not typically use pipe resonators. Yet even without pipes there are two sorts of resonators employed. In the case of mouth blown instruments, free-reed or not, the resonances of the players vocal tract are quite significant. Less often recognized as resonators are the reed chambers necessary to provide a secure mounting for the reed and to properly direct the airstream. The acoustical properties of these may or may not be beneficial. Because of their different reed construction, the Asian free-reed mouth organs require pipe resonators in to function. This paper will present examples of ways in which reed chamber and pipe resonances can enhance or interfere with tone production, as well as some interesting special effects produced by intentional mismatches between reed and resonator.