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howdy. i need a manual for my yamaha spx80 rack mounted effect. it's fun to press the buttons and watch the lights flash, but i think i could use it for other things as well. any help would be appreciated. thanks.

a friend of mine just "inherited" one of these (ARIA studiotrack 4 R504), and i'm having a lot of trouble finding any information on it. it's an older, rack mounted four track that seems to be in good condition. any information would be GREATLY appreciated. thanks.