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Blanks short impulse noise (ignition, electric fences, switching supplies) in USB, LSB, CW and AM. Lower threshold blanks more; longer gate removes wider pulses.
Quiets steady background hiss and band noise in USB, LSB, CW, AM and NFM. Higher level removes more noise but can make voices sound thinner.
MP3, 64 kbps. The recording stays only in this browser and is never stored on the server.