tis a lie!
it's hard to tell how it works because it's not actually hooked up to anything, but most of all! you can't see the exact settings of the range-slider...
just going by the sound, though, there's some basic modulation happening, and it makes me think that the first thing you could try is applying this to FM somehow... simplest way is to take the basic MaxMSP example called 'simpleFM~' and turn that into an MC-based patch, and then try to apply that phasor patch in the video to FM that way.
here i've done that for you, furthermore, listening to the video, and watching the meters, seems like maybe they have the range slider set to 'low-frequency oscillator' style settings(hearing range is 20Hz - 20kHz, so LFO range would be anything below 20Hz), so i went into the inspector of your range slider and set it up so that it now has a range of 0 to 100, and with a multiplier of 0.1, and most importantly, i checked the box which makes it put out 'float output', altogether making it so that the range slider can only range between 0 and 10 Hz.
(^also, MC-world is complicated, so i've set it up with 2 presets you can choose first to get some proper settings going, i recommend the 2nd preset first as it is simpler/lower-frequency in modulation... and i also put in the mc.number~ displays so you can check out what happens when you change the inputs to the 'harmonic $1 $2' messages)
with MC, it's hard to tell what the video applied such a simple patch to, it could've been anything, but going by the visual of the meters the settings of the range-slider were probably lower and more specific than you had, and going by the sound, it was probably applied to some type of fancier modulation and not the sound of the straight phasor~s.
hope it helps :)