Understanding FM #4 - Virtual tones and how sidebands become harmonics

If this is the first of my videos on FM you're seeing, you might want to pop back to the start of the playlist, as a lot of what I talk about this week relies on it:    • Understanding Frequency Modulation   Did you know that the ratio between carrier & modulator frequencies can define a sort of "virtual tone" at a lower frequency? And that ratio will tell you how complete the harmonic series for that new tone is? Well, at the end of this video you certainly will! Actually, this is a video I struggled with a bit. I think it is really interesting, and has something to say about what FM does, and how sound works in general. I'm also not 100% sure that it's really useful to people when it comes to actually using FM synthesis. But my goal here was to explain what FM was really doing, so here you go. During this video I show an abbreviated version of a demo, if you want to see the whole thing, you can check it out on my second channel, ‪@SoundsofVoltage‬