Once you're playing music, there is no next/previous playlist -- it's all been flattened down into the running order.
However, you can navigate the menu structure using the serial port, but you'll get no useful feedback from the serial connection.
Use 'm' to get into the menu, 'n' and 'p' to go right and left, and 'm' to go down a level. '*' goes back up a level. Press return to confirm the character, or sequence of characters.
Roger - not necessarily speaking for empeg
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roger