<hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)">This poster addresses the tension between theory and practice of research software development by contrasting sustainability requirements and</hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)"> </hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)">practical necessities. The practice is related to the research project Edirom Online Reloaded</hi> <ref xmlns="http://www.tei-c.org/ns/1.0" n="5" target="ftn5" /> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)">, in which the legacy software Edirom Online</hi> <ref xmlns="http://www.tei-c.org/ns/1.0" n="6" target="ftn6" /> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)"> </hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)">is re-developed for making it more usable with present technology (e.g. modern browsers, touch devices) and also as sustainable as possible. Edirom Online is an open-source software for digital scholarly editions of musical works. Further goals of the re-development project are to establish a base for future development of the software and to strengthen the existing community.</hi>