The audio frequency sinusoidal signal generator v.2.5 is intended for adjusting and measuring parameters of audio equipment. Works with 16 and 24 bit sound cards at sampling rate up to 384 kHz. Independent channels frequency and amplitude controls. Adjustable phase shift between channels. A step of frequency setting is 0.0001 %; level - 0.1 dB; phase - 0.1 degree. The minimum coefficient of nonlinear and intermodulation distortion is limited only to quality of a used sound card. The Sweep Frequency Mode with adjustable rate in linear or logarithmic scale. Multi Oscillators Sweep Frequency Mode. Generation of noise: white, pink (1/f), Brownian (1/f 2). Real time signal synthesis. Recording of synthesized signals to hard disk. The demo is completely functional, but the time of sounding is limited to 15 seconds after each clicking of the "Start" button. The registration removes demonstration limitation.