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Any chance the SERGE format could be relabelled as '4U' given that Serge is a brand not a format and there are a lot of other brands in that section?
-- loudestwarning

I think I can guess the answer here...there's two different 4U formats: Buchla and Serge. And they're FORMATS because the Buchla method is to separate the audio and control paths, while the Serge is 100% banana and has NO path separation. Each are definitely 4U in height, but they're not at all the same where the patching methods are concerned and not exactly 100% compatible.