I use the latest Vara HF v4.7.1. OmniRig settings:

What the built-in CAT is doing is not transparent to the user. To figure that out, I would have to do a RS232 trace in order to see the actual commands used for the setup. Maybe I'll try that later.

Found a workaround. VarAC has OmniRig as another option to the built-in CAT. With OmniRig all works just fine. So it is not a Remoterig problem, but something related to the built-in CAT . Problem solved!

Not at the moment. Will try that maybe tomorrow.

I tried something. While VarAC is active, I replaced the audio from the PC with the actual original microphone. While pressing PTT on the mic, the radio went into transmit and I got output while speaking. But by pressing PTT in the program I got no output while speaking - also while pressing the mic PTT. So, for some reason, it seems that the PTT being setup by the program is not the same as the real PTT from the mic - even if the radio PTT light goes on in both cases. 73, Per-Tore / LA7NO

Maybe the one who wrote the TS-480 setup module could give some hints?

Are there someone else who is using Kenwood TS-480, eventually also with Remoterig?

But since it worked flawlessly on Winlink Express, I had assumed it would be the same with VarAC. I guess it must have to do with some details regarding the setup of the radio. But it seems outside my control.

Correct.

After opening a VARA HF Winink session, Tune on the VARA HF moden works as it should.

Guess so, since there is only one installation of VARA HF. And that one is being used by both.

Yes, PTT Test work in VarAC settings