Thanks for the detail, Hugo - this may be useful if I need to make my own convertor.

Just one clarification, on the hardware side - IIRC, it's a mono 3.5mm jack plug, and you say the tip is 5V through 22K; is the ring grounded, or do we use chassis ground? And how does the tuner read the shift button - is that through the ring? (Oops, that's more than one question - sorry!)

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Toby Speight - 040103385