I have had a look at this max patch:
Is this principle of "variation in harmonics" possible to combine with a frozen spectrum (Jean-Francois-Charles-style), e.g. of a violin playing a tone? In other words, using the harmonics of such a spectrum instead of simple sine waves, as in the example? Maybe one could use a denoiser module to find the 10 most "significant" harmonics, and then bind these to a multislider?