SPDemo is an assisting tool for teaching speech & audio processing techniques developed in SIPL. Using SPDemo one can select from a variety of speech & audio processing techniques and parameters in a straightforward and simple way. The results of this processing are shown both numerically and graphically, in order to ease the analysis of data. The purpose of SPDemo is to enable experiments with different audio & speech processing algorithms without actually implementing them. For this reason, both ease of use and simplicity have been a main concern.