Investigating further, I fired up my other computer which hasn't been contaminated with the Zoom G3 software and downloaded the Zoom Tonelib for Zoom and it worked straight away. I guess there are software conflicts taking place on my Macbook which would explain why the Zoom G3Xn wouldn't pick up on there, but the G3X does and it used Edit & Share.
I've now completed the patches for the G3Xn & G3n so they too are free to anyone who needs help.
At this point I feel we owe thanks to the meticulous research of Paul Rossiter because I used his findings to make these patches and although we can't quite match the tone of the echoes on the Meazzi & TVS3, we have the correct timings which does make a difference and the sounds are an improvement on what we had over the past few years.
I have now sold my Zoom G3X and I have one G1Xon for sale with patches for £40 plus postage and a fairly new Zoom G3Xn with my 55 new echo patches @ £150 + postage.
These were purchased to do the work and I'm selling for what hey cost me.
PM me if interested.