It's a pretty easy setup.
We've used a Yaesu 1500 and also a 7100, Signalink, Soundmodem and Vara. All are using VOX and it works perfectly doing so. We are only running 1200 since the Signalink is an older model. I do recall that the Digirigs may need a pad modification as they can run a little hot.
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I used the same doc for guidance. However, I did not use the AGWPE settings, left it with the Packet/KISS options (depending on the software). Set all the port options to VOX.?
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Greg