Read through the introduction = Technology and Creativity in Computer Music (stop reading when it mentions Ch.2 - which is around page 10).
Read through Ch.1 = John Chowning - Stria and follow along with the supplemental software (listen through the piece completely at least once without pausing/stopping)
AM (Amplitude Modulation)
(turn on digital signal processing (DSP) and play the MIDI keyboard / turn knobs):