Well, some tutorials talk about “wobbly beat frequencies”, which are generated by detuning of two oscillators, or by phase shifting. If that’s making the “Reese” I would say that’s not directly translating into FM-synthesis.
But if we “detune” a Modulator/Carrier pair such that both are slightly out of tune, we will receive that wobblyness too … just as in subtractive synthesis.
If we start on the DN with (just as a starter and example)
- algorighm 1,
- x-channel,
- frequencies at a 1:1 ratio for OP-A and OP-C,
- give some level of OP-A modulation (~64 for a start),
- detune OP-A (~ 40 for a start),
- making it more complex, by introducing the Harmonics either to OP-A or OP-C
and listen carefully, we will hear some wobbling after a certain degree of detuning, which becomes faster the more we detune.
Now add the other spices of the DN and have fun …
BTW using other algorithms which let us detune OP-A and OP-B2 can create even more wobbling.
It’s also interesting to put the detuning or other parameter under control of an LFO, which can make for even more wobbling