I can't say for sure but it was probably this Roland GR-20:
http://www.roland.com/products/en/GR-20/


I'm no longer allowed to go caroling at the psych hospital.
I guess Do You Hear What I Hear was a bad song choice!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware