Tone Science sub-label, from DiN records, continues to explore the world of modular synth music. Following the success and critical acclaim of the first three Tone Science compilation albums, DiN label boss Ian Boddy has collated another nine tracks from musicians of varying backgrounds working in the realms of modular synthesis. Featured artists are Batchas, Lightbath, Panic Girl, Andrew Huang, Stefan Bojczuk, Ebcidic, Steve Davis, Mattia Cupelli and Tim Held. "Tone Science Module No.4 Form and Function" continues the journey down the rabbit hole of possibilities and sound worlds inhabited by artists and musicians working in this ever fascinating and varied musical field.