I have picked following mail. It may help you.
of course does not work (but luckily does no electrical damage).
Now the solution: When you are using the Signalink USB you MUST select VOX as the PTT method ni the
WSJT-x setup, Do NOT select CAT! CAT PTT takes tx audio from the Mic jack, not from the 13-pin DIN
connector on the rear panel.. PTT from the 13 pin DIN (supplied by the VOX in the Signalink) chooses
audio from that same accessory connector. .
Hope you succeed so I can work you on Field Day.
73, Reino OH3mA