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And if I remember correctly, it could be even played with up to 16 (or was it 8?) MSXes at the same time.

16. AFAIK, Triplex just abuses the standard MIDI protocol and each computer allocates one MIDI channel.

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Too bad those midi cables that are used to connect the music modules with each other, are kinda expensive,

Muh? Less than 5 Euro's for a 3 meter long MIDI cable (at eg. Conrad) is 'kinda expensive'?