Analysis of information sources in references of the Wikipedia article "یاماها دیایکس۷" in Persian language version.
At that time, a number of Yamaha departments were developing different instruments in parallel, ... the direct forerunner of the DX Series synths was a test model known as the Programmable Algorithm Music Synthesizer (PAMS). In recognition of this fact, the DX7 is identified as a Digital Programmable Algorithm Synthesizer on its top panel. / As its name suggests, the PAMS created sound based on various calculation algorithms—namely, phase modulation, amplitude modulation, additive synthesis, and frequency modulation (FM)—and from the very start, the prototype supported the storing of programs in memory. However, this high level of freedom in sound design came at the price of a huge increase in the number of parameters required, meaning that the PAMS was not yet suitable for commercialization as an instrument that the average user could program. / In order to resolve this issue, the Yamaha developers decided to simplify the synth's tone generator design by having the modulator and carrier envelope generators share common parameters. They also reduced the number of algorithms—or operator combination patterns—to 32.
