I actually just got a reply from Roland about this very subject, because I'm afraid of losing all my custom patches as well. What they told me was to simply use the "save sound" feature in the disk menu. Apparently this will save your actuall sounds, because "save song & sound" only saves the midi info......or something. I hope someone is willing to test this, because I'm too chicken to do it as well

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Edges of Seven
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Edges of Seven