Hi I'm Jupiter (my first synth was a Jupiter 8)

I ain't got no "JV" tackle yet. I have just A kn6000 arranger Keyboard. I am thinking of buying a JV 1080, but if my budget will stretch, a 2080. What's the BIG difference between the 1080/2080? - and do the Expansion cards sound the same on all JV modules?

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Jupiter