Yes, you will have compatibility problems.
A disk you create in your GX can not be read in your buddies EX. If he gives you a disk he's made in his EX, you can put it in your GX and convert it to GX. But once you have done so, he will not be able to read it (you have 16 v-tracks per track, he has 8 in an EX or plain 840).
Does your GX have a menu item for converting back to EX?
As far as I know, the conversion is one-way.
I'm beginning to think that every VS-840 user ought to keep a number of flash disks around - so they can go back and forth from EX to GX as needed. But - with the tendency of them to blow up once in awhile during flash update, I'm inclined not to mess with it if it's working.
Jack
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