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Has anyone assembled a list of some known early commercial releases of electrical recordings, specifically examples of the different systems? For instance, what were the earliest licensed Western Electric examples? What about the optical-recording systems -- there was the Hoxie system and wasn't there at least one other one? Were there other electro-magnetic cutters aside from Western Electric, am I imagining things or did I read once about an electro-optical-magnetic cutter (something somewhat similar to a light valve moving a cutting stylus based on soundwaves converted to electrical-lightbulb energy)? Also, is there definitive documentation as to when the first multi-microphone recordings took place? I know there were mechanical multi-horn systems, so the idea of mixing sound sources into one cutting channel was known before electrical recording too place, but were there multiple-microphone recordings right from the get-go or did electronic signal-mixers evolve? -- Tom Fine