the seller didn't leave the power cable attached?? boo

usually there is a small mark on the pcb by the header

I would not guess up - down is much more common- hence red stripe down being a saying! - but if there is no markings I would either contact the seller or the manufacturer to confirm before plugging it in

"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia

Utility modules are the dull polish that makes the shiny modules actually shine!!!

sound sources < sound modifiers < modulation sources < utilities