In reply to:

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does it happen to you, too, that sometimes some functions don't want to work immidiately?

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Yes, there seems to be a bit of lag. I think the convertor does some mapping of held presses - which is more than I actually want, as I'd be happy with straightforward volume and track controls, using the panel or remote for anything else.

When I get hold of some components, I'll rig up a simple adapter and post the details.