Hi Florian,
Nice to hear the answer is near! Thank you for the link, I'll check out your code on github. As far as I can see from Hans' answer and my test run, current adex neuron model in NEST3 runs with `tsodyks_synapse` just fine. This solves part of my issues and others could hopefully be worked around using NESTML which seems to be a recommended way for writing extensions.
Best regards, Alex.