You get the assertion failure because (format () ...)
sends its output to the current output; I think you
want (format #f ...) which just returns a string.
There is an assert macro in s7.html.
The "freqs" are probably negative because they are
phase increments ("instantaneous frequency") (in radians).
As in the phase-vocoder, it's using a sliding fft
and returning data for reconstruction as the
windows go by. pins in clm-ins.scm shows one way
to use this kind of data. The test-sv function
in generators.scm shows the parallel. sine-bank
below that function shows a direct use.
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