A prosody modification system for use in text-to-speech includes an input receiving a sequence of prosodic data vectors Pn, measured at time Tn, which samples a sound waveform. The first projection is received in the first recess to define a first cavity for a first sole and the second projection is received in the second recess to define a second cavity for a second sole when the second portion and first portion are mated together. In this way, the ultrasonic waves that are generated using a CMUT array can be physically steered to or focused on a target. The gas and filtrate may be separated from one another after passing through the filter medium. The image pick-up element is off in a substantially horizontal direction with respect to a center of the optical element, so that a position, on which an image of the center of field of view is focused, moves to the center of the image pick-up element.