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Searching the community archives, I see this was discussed a couple of year ago, but I've never found an answer.  Are there any plans to add Anti-Vox to SSDR?  Even with the VOX slider backed down to 0, I find it nearly impossible to operate Vox without using headphones and turning the speaker volume far below where it normally runs.
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Rick Hadley - W0FG

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Posted 3 years ago

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KY6LA - Howard, Elmer

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18.3.6 How to Configure the Downward Expander (DEXP)
The Downward Expander reduces the microphone input gain during the quiet periods between spoken words, eliminating extraneous background noise. This improves the apparent signal to noise ratio of your transmitted audio by “soft gating” ambient room noise between words.
To adjust the DEXP, Enable DEXP and move the DEXP Threshold slider to 0. While transmitting and listening with MON without speaking, adjust the DEXP Threshold until you can no longer hear the background or ambient noise at your operating position. In most cases a DEXP threshold level of 60-70 should be sufficient.
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Tim - W4TME, Customer Experience Manager

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Rick - yes, that feature request is on the list.