What’s wrong with this simple FM synth design?

Most synthesizers labled ‘FM’ in fact do phase modulation (PM, see https://en.wikipedia.org/wiki/Phase_modulation ). There are some benefits (mostly leading to more stable sound over a large tonal range). The OPL2 may use this too, I found no clear evidence, but the Wikipedia article also uses the term ‘phase modulation’. For short, many musical synthesizers labeled … Read more