What is the best range of frequencies to test yourself for when doing biofeedback scan?

A waveform like square waves has harmonics which go higher. The biofeedback presets take advantage of this to cover a large range of frequencies. However, harmonics do not go lower. So it is best for the user to scan from the lowest frequency to the first odd harmonic which a square wave will produce. For example, 75 kHz to 215 kHz is a good range to scan.

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