As Allen Strange put it, one way to describe sub-audio FM is as pitch ornamentation. A series of trills can be produced with a sub-audio square wave controlling the exponential FM of an oscillator.
In this video, Strange's patch is explained and created using MATHS, modDemix, and Pressure Points. Then we explore an alternate "digital" version of the patch using TEMPI and René.
http://www.makenoisemusic.com
