Yamaha TX416 For Sale. This unit contains 4 TF1 modules, each of which contains a vintage DX7 synth engine, so it's like having 4 DX7s in a rack. Includes original box and manual. Note the box says TX216, which had only 2 modules in it. This unit's in beautiful shape and has just been serviced and fully tested. All batteries were replaced and 8 capacitors were replaced as well in an effort to keep this unit working well longer than all unserviced units on the market.