Quadrumvibrate is a duet that unfolds as a dynamic interaction between two performers and the generative systems they activate, forming a quartet of human and machine actors. The work explores evolving sonic and rhythmic textures built from algorithmically generated and modulated rhythmic sequences, realised through layered, synthesised percussion. Each performer plays a Beat Machine, a custom electronic musical instrument they built themselves, housed in a bespoke wooden enclosure featuring a concentric, circular user interface layout. The instrument generates a deliberately lo-fi oriented sound pallet and offers a range of rhythm‑generation algorithms, including Euclidean, polymetric, polyrhythmic, geometric, and probabilistic approaches. Rather than presenting fixed material, the performers actively shape the music in real-time through direct intervention, triggering, modifying, and regenerating patterns and sounds as the performance unfolds. 

Structured as a sequence of contrasting sections, the performance moves between driving, pulse‑oriented passages and more sparse, atmospheric sound worlds. Musical form emerges through the performers’ ongoing interaction with generative systems, as they respond to rhythmic and timbral change. Visual and gestural interaction with the instruments supports clear performer agency, allowing experienced musicians to maintain expressive control while embracing unpredictability. The work foregrounds performative decision‑making, interaction, and responsiveness as central musical elements, demonstrating a refined balance between human intention and algorithmic behaviour in live electronic performance.