For this demo a variety of sound signals were recorded in a recording studio at the Center for New Music and Audio Technology (CNMAT). These recordings were converted into digital signals using an Analog to Digital Converter (ADC). Software synthesis programs generated a sound file as their output (a sound file is simply a data file stored on a disk). After all the samples for a composition are calculated the sound file can be played and heard through a Digital to Analog Converter (DAC). For the details on how sound can be recorded into computer sound files see the 1996 book by Curtis Roads, The Computer Music Tutorial (The MIT Press) Many different sound file formats exist. The differences between such formats are mainly the rate at which the sound signal was sampled and the number of bits per stored sample. This information is usually contained in the header of such files. The sound files used in this work were sampled at 44.1~kHz and used 16-bit words. The particular format used by the SGI computers, at CNMAT, is the Audio Interface File Format (aiff). The CNMAT aiff files are in stereo (two channels are recorded). For this work only the left channel was used and for these files the left and right channels were practically equal. The aiff sound files used in this work are available via ftp from the CNMAT server.