jadugar,

I don't own any Roland instruments, so I am only responding based upon what I have read on various synth-related sites (including this one). The XP-30, XP-60, XP-80, JV-1010 and JV-2080 all have the problem of which you speak. The JV-1080 is the only available module in that series which reportedly does not have the issue.

Simply put, if you want an XP-series board (and while I don't own one, the keyboards sound good to me), you might as well get the XP-60 and save a few hundred bucks.