A strange thing happened.. The empeg stopped producing sound.
After rebooting, reflashing and generally panicing, I discovered the volume had been set to negative infinity.
How odd....

Jazz
(List 112, S/N 00030, 4 gig blue)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)