Hello,
I can say that the keys of the PA80 are much better than the 2000. The other differences are vast and you will have to have a long check list of what's important.
Good luck,
zuki
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Yamaha 920 / Yamaha Stagepas 100 BTRs / Senn e935 - LIVE
Roland RD 2000 / Tascam DP24sd / ATEM switcher - STUDIO