Hello, im interested in a voyager, but it is v2.5 and I wanted to know if it is a paid upgrade to go to the latest version with 700 plus patches?
Also he says it has no input mixer knob, was there a version that didnt have one?
All OS upgrades have been free. However, it may only have one bank of 128 sounds instead of the 8 banks that come on later voyagers (the expanded memory is, of course, a hardware upgrade). I have a Signature Edition w/ only the 128 memory slots, but I’m running the latest OS. As far as the input mixer knob, I think he just means it’s missing the black knob, not the potentiometer, as all voyagers have an input mixer pot. Hope this helps. 
-andrew