The Legio Overlay Pack from Noise Engineering allows effortless changing of the panel labelling by simply putting on an overlay; no mechanical panel change by disassembly is necessary. The Module of the Legio series can be operated with an alternative firmware, therefore it is not mandatory to buy all three Module if you only want to test the other sounds once. So if you often change the firmware and always need the correct labels on the module, you can hardly avoid OverlayPack.