also late to the party, but here is my little contribution:
@_mark I think it’s better to have a base frequency (which eventually is the fundumental) and separate harmonicity ratios for both carrier and modulator. This helps to put easier ratios like 2/3 etc and also keep a sense of where the fundamental is…
The use of some index envelope is important to produce spectral motion.
Moreover, and for shake of clarity, for simple-FM I would only use a single carrier/modulator combo. Anything beyond this (multiple carriers and/or modulators in any combo) it’s placed under the complex-FM category.

take a look at this patch:

simpleFM (vals).maxpat (19.0 KB)

1 Like