Hello forum,
Sent this to the list, but thought I'd possibly pick some more brains.

I’m looking for a way to impose a harmonic spectrum on a non-harmonic
signal in real-time. I tried cross-synthesis with a harmonic signal, which is ok, but
what I’m actually trying to do is to “tune” a field recording, in a way,
so it can have harmonic relations to a live instrument.

I played with the pvtune~ object from fftease which is nice, but the
results end up sounding a bit autotune-ish. And I also tried driving a few
vcf~ filters whose frequencies are set by bfcc~ from timbreID and relative to a fundamental tracked by fiddle~/sigmund~; also nice, But this still sound like imposing the harmonic characteristic on an existing spectrum, while I think I am looking to arrive at harmonicity through something like moving the frequencies of the partials into their closest values according to the harmonic series (so moving from bins=>partials).

Can this be done? it would entail changing the frequency of each bin
separately.

Wishart describes in his book a technique he calls spectral focusing,
which relies on lpc. He says that lpc can be set to generate a filter bank
which is distributed evenly with respect to pitch, but I’m not sure I
understand what he means and how it can be done in PD. lpc seems to output
a set of amplitudes for the coefficients. Can I set the filters to
frequencies of my choice?

Any help whatsoever with this would be greatly appreciated,
Zax