Combining waves - Schumann resonances

Working on combining frequencies. Is it best done with (sim [beh1 beh2 …])? Or with a table of harmonics added together?

Trying to emulate Schumann Resonances in audacity. These are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth’s electromagnetic field spectrum.
7.83 Hz (fundamental) 14.3, 20.8, 27.3 and 33.8 Hz


Difficult to say which is “best” as that depends on what you are doing.
(sim [beh1 beh2 …]) is possibly easier to understand and use.
build-harmonic would be quite tricky for extreme low (and non-integer) frequencies.

As a simple example, to create a waveform that combines 7.83, 14.1 and 20.3 Hz:

(mult 0.3
    (hzosc 7.83)
    (hzosc 14.1)
    (hzosc 20.3)))