Coding these oscs and distortions help me to learn many tricks and gave me new ideas.
I have a few other oscs to experiment with.
About the general phase modulated/distortion wavetable algorithm,
I'm focusing on the integration/differentiation scheme. So, my first attempts use a hardcoded wavetable/distortion.
All my attempts to make a DP2 antialiased phase modulated wavetable osc failed so far (accuracy of division).
Thus, at the moment i'm limited to DP1 antialiasing + x2 oversampling scheme. But well, i think i will stick to it.
Soon I'll have to look at how to use SDCard/SDRAM/SRAM .