Unlike speech, the sound produced by the Sonet APS has no "structure." It is easy for the user acclimates to it, and the added background sound from the Sonet APS just fades away; one simply doesn't hear it. © Cambridge Sound Management 27 Moulton Street Cambridge, Massachusetts 02138 800 / 219-8199 617 / 349-3779 telephone 617 / 349-3788 fax info@cambridgesoundmanagement.com