Not sure there is any universality in this area, and I'm drawing a blank on that model number. Which Yamaha product was this remote supplied with? No promises, but I'll do some hunting...
I had an inkling Densens used Sony drives, but it looks like these players use some control software written by Densen to control the drive. You could try the remote commands for some common drive manufacturers, using codes for Sony, say, or Philips, and see whether this gets you anywhere, but it's a bit of a long-shot.
Got a feeling the Gizmo and these components use a slightly different control protocol - using a burst of infrared rather than just a single pulse - which means they won't work with normal learning/programmable infrared remotes. But something like a Harmony may be able to handle them - I'll fire up the Logitech software on the PC at home when I have some time one evening this week and see whether the player's on the list.