mdorantes,

At last ... some time to get back to synthzone q&a.

The EXP doesn't alter the OS in anyway and can't cause a malfunction in the OS. Since the modifications are DISK related loading/unloading of files (if the installation is not done properly) could be an issue, but can be fixed through a RESET.

Advise your customer/friend to re-install OS 4.0c from the website (www.ketron.it) and this should fix any strange behaviour of his SD1 Plus EXP.

Thanks,

AJ