Well, for most keyboards that are upgradable like Ketron/solton or for that matter ANY brand, when you install a new OS......you will lose registrations, midi set ups, programs, Power On set up, etc....years ago, since I got my fisrt X1 and then my SD1s......every time I change the OS, I previously save all the above....that also happens to other brands too.....not matter what.
So far in the SD1 4.0c, I have notice no drop outs so far.....still more testing to do.
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mdorantes
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mdorantes