Apparently mine is the factory standard tuning for a Hohner Gaelic in D/G. At least that's the reed set they sent for it so it's not customised. Customised is when you go to the tuner and ask for the layout on the instrument you bought to be changed.

BTW, where does Joe indicate he is talking about a 'straight-up-and down' D/G box? On the melodeon.net website there are several 'standard' layouts for D/G boxes. He's still right, though, they're not as limited as some people think.