Itīs now clear that every synth/sound module of the JV-XP series (XP-50, 60, 80, 30, JV-1080 ,2080 and 1010) has the same problem with timing.
But still thereīs something more on the JV-2080 in comparison to the 1080! The 2080 has to handle more information which makes it slower, though they use the same processor.
You can read a reply on this matter that I posted to DJ Wunder on synthzone on the 1st of may 1999. The fact that the same sequence works better on a JV-1080 than on a 2080 says it all.

Could a new Roland synth/module (JV-3080?) on the market solve these problems?
Well, one thing is for sure! Then I would have to choose between -keeping the old synth/module and keep on feeling cheated; or feel forced to buy a new one from the same people whoīd been cheating me. And thatīs no good solutions!?

So I say ROLAND- donīt put more sh** on the market before you FIX this first!!! And that NOW!

PS.on the problem- These synths can surely get completly out of timing and you don't have to be a professional to hear it. When you really get to know how to do, to make these failures show up, you probably won't believe your hears. I didn't..!
I can hear it already by using TWO voices at the same time which means that these synths can never playback a song in the right way. Even LIVE it won't respond exactly to your playing. So there are no workarounds!
Well.., Roland could have marketed these synths as Solo-synths or as 64-voice synths with a warning for playing more than one note at the same time!