I'm sure the Korg sounds great. I've just been looking to see if there's any way to keep the files as DSD all the way to the DAC.
I've never done this myself, so this is guesswork. It looks like you can use the Tascam just like you're using your Korg now to play files. But the Tascam would play a DSD bitstream output on BNC, which the Emm dac would receive on its BNC input. So, this method needs the Tascam as an intervening device.
Now here's where I'm really just guessing: You could store and play DSD files from your PC directly to the dac, if you had something like a Pyramix (Merging) workstation. This takes at least a Merging motherboard and an I/O card at the PC, which would output a DSD stream. I have no idea how much these cards and software cost, but I'm guessing they're very pricey. And you may not want to get this complicated or this much into it (not sure I would either now that I'm seeing what's involved at the PC end).