A combination of a simple frequency modulation patch and a ring modulator.
fm-fmaudio-mix: this slider mixes between the dry FM signal (left) and an optional incoming signal which is then ring modulated with the FM-signal (right).
amplitude: overall volume control.
carrier_freq: base frequency.
harmonicity: modulation frequency. (this only works when modindex is above 0)
modindex: modulation amount.
Ramp sliders should be self explanatory. Each parameter also has an optional signal-input. Shown values function as offset then.
act by firstname.lastname@example.org & klaus