Worked on the tidalcycles/strudel repository to deliver REPL instance management, focusing on introducing a solo mode that enforces a single active REPL to prevent conflicting states during front-end development. The implementation included a scaffold for sync configuration, laying the groundwork for future synchronized session behavior. Refactored the REPL configuration logic to improve maintainability and readability, particularly around the handling of solo and sync options. Incorporated minor code formatting improvements alongside feature development. The work was carried out using JavaScript and front-end engineering practices, emphasizing code clarity and preparing the codebase for more robust, synchronized workflows in upcoming iterations.