Thank you Peter for your reaction and explanation.
Let me try to reflect on my understanding of your answers.
An extio_*.dll file can be used to create the intermediate layer to tune the radio from the G8JCFSDR? software.
Question: why can I not use the RSP1A extio.dll to do this in the current version? I only want to use the subset of commands from the full extio world to do the tuning.
Is this a result of the way the extio.dll tuning capability is currently implemented?
I would love to understand the art (or science) of creating extio_*.dll for a given combination of hw and sw better, I find it hard to find that kind of information on the net.
This might be of interest to you and others :?
?written by a well-known radio-amateur I2PHD
And this :?
In the meantime I will use your software for my (new) Elektor SDR shield + Arduino ;-)
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PE3ES / F4VTQ de Erwin