DX-7 Synthesiser T-Shirt Organic / BlackFPC iconic acid house clothing and amazing t shirts and rave clothing, we are the bees knees of tees and more. Unofficial tribute to the Yamaha DX 7 FM (frequency modulation) synthesiser. Notoriously difficult to program, so most artists used the saved patches in many hit records. This design uses the original logo with an embedded image of the actual front panel of the DX 7. Future Past original, not available anywhere else.