6400M + MAC + WSJTX

We both use Mac computers with Mac logger DX and dog park SDR plus the WSJTX program - both have radios with V 3.1.8.145

Mine is working okay but Bob has a problem ! 

He has the receiver side working okay via “Loop Back Audio” doing the audio linking between programs but the issue is the transmit side

It looks like the 6400 M is busy with an active slice and won’t permit the computer side to take over and act as a transmitter source.

The next bit of confusion comes because on the Maestro menu/radio I have the ability to “switch radio” But on the 6400M in the same position it says “switch version”

So the big question, if you have to make the 6400 M go to an “off mode”  while the computer deals with the data program via dog park SDR - where is the switch on the 6400 M to enable you to do this ?

We have followed the preferred settings procedure and everything is set up to work, it’s just the issue of getting the transmit audio tones which are being sent from WSJTX through to dog park SDR but we can’t get them to go from there to the 6400 M - using the “Monitor function” in Loopback you can hear the tones are there - but that’s as far as they go !

Many thanks

Phil G4UDU