Hi Chas
I think your decision to buy a Gbox V3000 is a good one. I have owned both the Gbox and Vbox and prefer the Gbox.
If your sat receiver is NOT capable of Diseq 1.2 commands then that is the standalone mode where you have to use the Gbox remote to move your dish to each of the (99 available) sat positions. So in this configuration you have to use two remotes which is more complicated. The Gbox box remote moves the dish to whatever preset sat position you setup and your receiver remote to change channels for that satellite.
If your sat receiver is diseq 1.2 capable (most are) I would connect your receiver as per the diagram on page 4 of the manual. This means your receiver controls the Gbox and you only have to use your receiver remote for daily use. Then during your intial programming of the Gbox you move the dish to the proper actuator count position for peak signal on whatever sat the receiver channel is set to then use the receiver to program the Gbox for whatever Diseq 1.2 preset number you wish to assign to that satellite. Your sat receiver should have a Diseq 1.2 setup menu for each sat that you use to assign a Diseq 1.2 number (to say AMC-1 for preset number 30 for example). As you program the preset number in the receiver it sends a command to the Gbox via the rg6 cable to assign whatever actuator count you are on to the preset number you have chosen. Then I use the Gbox remote to assign one of the Gbox predetermined names (found in page 7 of the manual) to that Diseq 1.2 positions preset number.
Once you have gone thru the intial setup of of all the satellites in your viewing arc and assigned the names and Diseq 1.2 numbers to the actuator count values you only need to use your receiver remote. So when you change channels in your receiver it sends Diseq commands via the rg6 cable to tell the Gbox to got to preset number X. Your Gbox them remembers that preset number X is located at acuator count xxxx and goes there.
Hope this helps,
Kevin