Antidote Action

Tracks 1 to 3 are line recordings. Tracks 4 to 6 were recorded on November 23, 2025, using dummy head microphones, with a synthesizer system performing on 32-channel speakers. Tracks 1 and 4, 2 and 5, and 3 and 6 are identical tunes. Please listen to the tracks using headphones and enjoy the differences in sound imaging. The synthesizer system consists of a computer, a universal serial bus (USB) audio interface, a USB device, a line selector, a buffer, a filter, and a mixer. The 32 speakers were arranged in the same manner as when the system was recorded on October 9, 2025. The filters for tracks 1 and 4 use a Sallen-Key circuit, a whitening filter, a biquad circuit, and a state variable filter. To perform this track, the feedback circuit of the Sallen-Key circuit was improved, and a new state variable filter was developed. The filters for tracks 2 and 5 use a multiple-synthesizer system, a Sallen-Key circuit, and a state variable filter. This Sallen-Key circuit differs from the one used for tracks 1 and 4. Tracks 3 and 6 use a whitening filter, a biquad circuit, and a state variable filter. Tracks 2, 3, 5, and 6 play Waveform Audio File Format (WAV) files on the computer, in addition to the Pulse Width Modulation (PWM) signal output from the USB device. This signal is played back via the USB audio interface and the mixer through the eight speakers arranged on the left and right. The PWM signal is played back via the line selector, buffer, filter, and mixer through 24 speakers positioned at the front, rear, left, and right. This system is a synthesizer system capable of audio playback. Through improvements to and development of its filters, this system can now produce more novel sound output than conventional systems.