[Repeated from Thursday 4.30pm.] A monthly open-form radio series that traverses archival fragments, field recordings and sonic atmospheres to examine the material and affective dimensions of imperceptible infrastructures.  This edition examines the relationship between sound, behaviour and computational logic through archival recordings of early computer music, arcade environments and interactive gaming systems. Algorithmic compositions, electronic signals and responsive musical environments reveal how sonic expression is shaped by decisions and their consequences. The programme combines fragments of historical broadcasts, gameplay recordings and electronic compositions, including Laurie Spiegel's Music Mouse and Masaya Matsuura's Vib-Ribbon. These recordings preserve traces of earlier technologies and the conditions through which sound was generated, while the original interactions are often only partially accessible. Programmed structures establish limits on behaviour, yet players and composers find ways to manipulate, reinterpret or work against their intended functions. How do the sonic environments of technology-mediated play and interaction shape our physical responses, memories and understanding of the systems we engage with? Presented by artist and researcher Florence To. Visit invisiblesignals.org.