Yamaha TX81Z FM Tone Generator Used
Description from Vintagesynth.com
The TX81Z is a late 80s compact, multitimbral, 1-unit rackmount module and is basically a key-less version of the DX-11. It has far more professional features than its relative, the FB-01. The TX81Z features great FM type synth sounds similar also to the DX-21 and DX-27. It's still not as good as the classic DX-7, but it's an inexpensive source of those sounds with lots of programmability. Eight voice polyphony, 128 preset sounds, 32 user and lots of functions hidden behind 11 push buttons.
In excellent cosmetic condition, just given a checkup and clean bill of health.