Yamaha_TX81Z
The Yamaha TX81Z is a rack-mounted (keyboard-less) frequency modulation (FM) music synthesizer, released in 1987. It is also known as a keyboard-less Yamaha DX11 (and the subsequent Yamaha V50 (music workstation)). Unlike previous FM synthesizers of the era, the TX81Z was the first to offer a range of oscillator waveforms other than just sine waves, conferring the new timbres of some of its patches when compared to older, sine-only FM synths. The TX81Z has developed a famous reputation, largely based on some of its preset bass sounds. The Yamaha DX11 keyboard synth was released the following year, offering improved editing abilities.