Effect pedal, MIDI on a Jack.[SOLVED]

By Antichambre in Design Concepts,
I've got a question! I was about to buy a small interface box for two of my effects. but when I saw the price I thought that there was probably not much in it and that I could have everything I needed to tinker with one.

Someone has already opened one of these boxes?
I suspect they have just put an optocoupler and distribute the logic level on the Jack outputs?
And Empress call their one, midibox

Thank you

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