Critical Bug

Two kinds of multiple synthesizers, five kinds of state variable filters, a biquad circuit, whitening filter, Sallen-Key circuit, and an all-pass filter were for the synthesizer system. The oscillator was also further developed so that the timbre of this system can be altered. The multiple synthesizers connect with the computer synthesizer and can carry out both amplitude modulation and sound synthesis. The filter used for this system can choose six filters depending on the tune. The oscillator is used for the tunes, except in the case of track 5. A pulse-width modulation signal of a control signal is input to the analogue photocoupler of an oscillator, with both timbre and oscillation controlled for. Because the timbre concerning the other filters is complicated, the simple timbre of the oscillator can change the impression of the tune itself. On tracks 1 and 3, dissonance is achieved using the Sallen-Key circuit and oscillator. This dissonance is jarring with the oscillation sound. Furthermore, a harsh noise is made using a state variable filter, and which mixes with the dissonance. Therefore, a tune can have a hard and offensive style. On track 5, a low-pitched sound is made using the state variable filter, biquad circuit, and multiple synthesizer. Because these filters induce a dark timbre in an intricate manner, a tune is contrasted with the tune which used the Sallen-Key circuit and oscillator.