Pure Electronics

Tracks one to three are binaural recordings, while tracks four to six are line recordings. When listened to through headphones, the binaural recordings produce a sound image localized outside the listener's head, whereas the line recordings localize the sound image localized inside the head. For the best experience, please use headphones and enjoy the three-dimensional sound. A binaural recording of a synthesizer system performance, played through 24-channel speakers, was conducted on December 6, 2024. The synthesizer system consists of a computer, universal serial bus (USB) device, line selector, buffer, filter, and mixer. The speaker arrangement closely mirrors that used for recording the track "Hate Suppression" from the album "Random Noise Stimulation" on September 9, 2024. However, the rear speakers' height from the floor was adjusted from 15.5 cm to 22.5 cm. A dummy head microphone was placed at the rectangular center of gravity formed by the speaker for recording. The front speaker unit was a Fostex FE166NV2, the left and right speaker units were FE103NV2, and the rear speaker unit was a P1000K. In the first track, two state-variable filters were used: a digital delay and a biquad circuit, referred to as state-variable filters 1 and 2, respectively. Each filter features different circuit designs, resulting in unique timbres. The eight forward speakers played signals from state-variable filter 1; the eight left and right speakers played signals from the digital delay and state-variable filter 2; and the eight rear speakers played signals from the biquad circuit. Each of the eight speakers uses a mixer to move the sound source, thus playing back three-dimensional sound into the original sound field. Owing to the inherently harsh and inharmonious timbres of each filter, the noise music produced by the 24-channel speakers evokes an impression of instability for the listener.