I downloaded and installed RecAll Pro.
It has what appears to be a standard
level sensing VOX switch. Unless I am
missing something.

One implementation, in hardware, can be seen at:
http://www.qsl.net/kc7bum/hf_squelch.html
This is a very usefull device, but I am looking
for a way to do it in software.
-------------------------------
From a thread on the R20000 listeserve:
"
Message 703 of 714
From: W6AFK w6afk@a...
Date: Fri Jan 28, 2005 10:53 am
Subject: Voice detection software?

Lou,

Voice squelches for HF are typically "syllabic squelches". They do not
react on noise but on the pattern of the signal. Simple hardware based
ones
try to detect the presence of voice (low frequency syllabic variations
associated with voice). Although not perfect, these types of squelch
circuits are fairly common on commercial and military HF equipment.

Noise based squelches are practically unusable on HF as they are
triggered
by any random noise... and as we all know, HF-AM/SSB sure isn't FM ;-)

However, I agree that it would be an interesting project if someone
created
a software-based syllabic squelch application that can be used with any
radio... any takers? ;-)

Bruno,
------------------------

Terry