a common space & database for harmonic overtones
The human voice spectrum does not contain undertones, but you may find voice functions that mirror the harmonic series of overtones. It is not a very widespread technique and most kargyra singers only produce the frequency half of the primary tone. Jan here very extemporally demonstrates 2, 3 and 4, do- fa- do -- an inversion of the do'- so'- do' of the harmonic series which arise from the same factors. Jan told me, that on a good day he may get as far down as the 7th factor of the subharmonic series. Amazing!
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