The minimum is about 10 % (with the signal to receive). Below 1 %, the signal is mixed with a digital noise due to the sampling process, so the Signal to Noise ratio degrades…
It seems curious and not classical to remain with a residual level. Normally the signal increases linearly with the level adjusted on the Windows mixer (microphone).
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On the RX/TX screen, the "Level" field shows only 0% or1%, never higher.