TDL® Technology announces their Model 109, an audio arbitrary waveform and pseudo-random noise generator. The pseudo-random sequence is produced by simulating in the Scenix microprocessor a 21-bit maximal-length shift register with feedback. The test mode and output voltage can be set from the front panel or by a personal computer over an RS-232 link. The arbitrary waveform EEPROM can also be programmed over the RS-232. Our WAVEMAKR software generates a variety of arbitrary waveforms. These include tone burst, ten equal amplitude sine waves, frequency sweep and square wave. This software is included at no additional charge and it may also be downloaded form our web site.