I'm surprised to find that author of such excellent books about FM and DX synths writes that all Yamaha synthesizers before FM-X arrival have used only sine wave in the operator. What about TX81z, DX11, V50, SY/TG77, SY99, FS1r?

Does FM101, Part One, esist?

Does FM101, Part One, esist?

Yes. Find it here: FM 101 Discovering Digital FM Dr. John Chowning Remembers

... you may be able slide by saying the TX81Z's extra waveforms are still based on sine waves (halves or quarters of the sine wave phase shifted and pasted together). But when you get to the FS1R - that's the "same" implementation as FM-X for voiced waveforms. I'm not aware the FS1R called this "FM-X" and FS1R predates Motif Classic by 3 years.

I'm not sure this historically inaccurate trivia detracts from the meat in the article. It could have been lost in translation by the document writers/web crew - so it may not even be Massey's fault.

A recent interview had me start reading the FM101 articles. On the theme of article feedback ...

FM101 - Part 2

The frequency diagram in the original article (1st two waveforms), to me, visually implies the same frequency. The time scale has to be added to make these two waveforms match the description. That 3rd waveform I added would be a more correct waveform for doubling the frequency if no time scale is given as lack of time scale would generally mean all waveforms use the same scale.

The next image in the article with 3rd & 4th harmonic is similarly unclear.