As you've correctly guessed, the "next playlist" function doesn't exist, mainly because empeg playlists don't exist in a linear fashion. We have no idea what the "next one" is because the playlist you're in can exist in many different places in your playlist tree.

Having said that, you *can* remap front-panel buttons using Hijack IR translations. You just don't have a "next playlist" function to map them to.
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- Tony C
my empeg stuff