Micromega DUO DAC D/A Converter - how many Versions on the Market? - Overview wanted

Until now I thought that there were only two versions in a small outline: "BS" and "BS2" (BS means bit stream)
But obviously there were additional versions, like this version with integrated pre-amplifier (i.e. including volume control and source select resp. input selector for two inputs) - go to
https://pinkfishmedia.net/forum/threads/early-micromega-duo-dac.254337/
This version I had never seen before. Unfortunately there is no image with sticker for reading the exact model naming.

Under
https://vasiltech.narod.ru/CD-Player-DAC-Transport.htm
is mentioned the version "BSY".
On the web I don't find any information concerning this version.

And by chance I discover in the normal outline the versions "PRO" and "PRO2".
Who have an exact overview of the whole DUO series from Micromega ?
 

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  • Micromega DUO DAC+PRE front.jpg
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Images DUO BS - maybe all BS versions equipped with SAA7220 (but I don't know exactly).
 

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  • micromega-duo-bs 0073 SAA7220 front.jpg
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  • micromega-duo-bs 0073 SAA7220 toroidal.jpg
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  • Micromega DUO BS SAA7220.JPG
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BS2 versions; whether the BS2 version is equipped only with the Yamaha input receiver IC YM3623B or also with CS8412 - I don't no.
 

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  • Micromega DAC DUO BS2 Korea sticker.jpg
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  • Micromega DUO BS2 owner's manual.pdf
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  • Micromega DUO front CS8412CP.jpg
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  • Micromega DUO rear CS8412CP.jpg
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