stant (DC) term (0.05 in this case), this oscil produces a sine wave at its nominal frequency + (radians-&gt;hz 0.05),
an offset of about 351 Hz at a 44100 Hz sampling rate.
This extra offset could be a disaster, because 
in most cases where we care about the perceived fundamental, we are trying to create harmonic 
spectra, and that is harder if our modulator/carrier ratio depends on the current FM index.
If you are using low indices and the top pair's 
mc-ratios are below 1.0 (in vibrato, for example), you