“Yamaha RX11 drum machine.
Fully working, bought used a couple of months ago but selling due to a new Octatrack in my way.
The unit is fully working, however 3 button caps are missing so I covered them with gaffer tape to not let the dust in, and they work nonetheless.
The missing caps can sometimes be found on Ebay or other synth related spare component websites.
So yes, it’s fully working, real nice sounding (also I opened and cleaned it up the day it arrived so you’re actually getting a nicely cleaned machine)”
Click here to visit listing on eBay
“Yamaha Digital Programmer RX11
“Yamaha RX11 Drum Machine Digital Rhythm Programmer Vintage Classic USED. Condition is Used and Working.” 
“Yamaha RX11 Digital Rhythm Programmer Drum Machine. Condition is Used, Tested Working”