that is identical to my 555 which i think is rubbish btw amongst many problems is the buttons are way too small, i paid £75 for mine from Richers about 2 stretch ago.
how much the 515 mate?
just downloaded the latest firmware gunna see if i can get it to work properly with the Duo now, i threw the 555 to one side about 5 months ago and not used it since, been using the Duo original well it does ok for me.
regards: canthackit