The presentation is cool but the order here is pretty bad. When teaching subtractive synthesis, you really should start with the oscillators and their waveforms (sine, tri, saw, square), then talk about filter, then amplitude. That’s really all there is to it - create a fundamental and a series of harmonics, carve it away with a filter and then give it an amplitude envelope. I love Ableton, but I think they may have been a bit too focused on making this look nice.