Seems like it should be possible in The Grid or by some other means to apply FM to audio in real-time, and have the operators be key tracked appropriately. It's been possible with FM8 for a while so there shouldn't be any technical reason why it isn't possible.
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My favorite way, that I haven’t seen talked about, is to put phase 4 in an fx layer. Put one oscilator at -45 phase, full shape in saw mode, and set the harmonic to zero. You can use the audio rate modulator to send audio into the frozen oscillator(s). It is not quite a linear transfer, and folds back if the audio comes in too hot. Expand the device view to see how it is working visually.
Phase-4 has the advantage of having a one sample feedback latency across the entire device. I mostly use this to give a digital edge to synthesized drums. Envelopes/envelope followers are your friend, and nothing is stopping you from sending out one of the pure sines to beef up a harmonic.
I will try this.. I tried to use the audio rate modulator into a wavetable that had the 'dc offset' wavetable which is basically a wavetable thats a straight line that goes from -1 to 1 over 256 frames, simulating the DC offset device, if that makes sense. This did not work because the actual oscillator is not making any sound, so changing the phase of it does nothing. I'll try your thing now.
Ahh makes sense. Polymer doesn’t have a phase control for the wavetable other than sub pm. You are storing the audio into a wavetable to get a phase control (by having your sound source be a modulator). With phase-4 you can freeze it, approximate a saw, and modulate the phase in the operator to store the incoming sound.