From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta01ps.bigpond.com ([144.135.25.133]) by speech.braille.uwo.ca with esmtp (Exim 3.34 #1 (Debian)) id 16r4Lq-0004KF-00 for ; Fri, 29 Mar 2002 16:56:02 -0500 Received: from data.home ([144.135.25.84]) by mta01ps.bigpond.com (Netscape Messaging Server 4.15) with SMTP id GTR8XF00.8AS for ; Sat, 30 Mar 2002 07:56:03 +1000 Received: from CPE-144-136-137-64.qld.bigpond.net.au ([144.136.137.64]) by psmam06.mailsvc.email.bigpond.com(MailRouter V3.0i 110/253771); 30 Mar 2002 07:56:03 Received: from geoff by data.home with local-esmtp (Exim 3.12 #1 (Debian)) id 16r4Lq-0000ZL-00; Sat, 30 Mar 2002 07:56:02 +1000 Date: Sat, 30 Mar 2002 07:56:02 +1000 From: Geoff Shang To: speakup@braille.uwo.ca Subject: Re: alsa and sox questions In-Reply-To: <20020329195442.E32010@joana.gotss.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: speakup-admin@braille.uwo.ca Errors-To: speakup-admin@braille.uwo.ca X-BeenThere: speakup@braille.uwo.ca X-Mailman-Version: 2.0.8 Precedence: bulk Reply-To: speakup@braille.uwo.ca List-Help: List-Post: List-Subscribe: , List-Id: Speakup is a screen review system for Linux. List-Unsubscribe: , List-Archive: On Fri, 29 Mar 2002, Kerry Hoath wrote: > My sox does not have agc, this is version 12.17.3. > It has avg but that is for merging channels. avg is what I meant. In my version, 12.16, you can also use it to extract either the left or right channels. Here's the bit from the man page: avg [ -l | -r ] Reduce the number of channels by averaging the samples, or duplicate channels to increase the number of channels. Valid combinations are 1 - 2, 1 - 4, 2 - 4, 4 - 2, 4 - 1, 2 - 1. The -l or -r option is not really averaging but either duplicates or leaves just the left or right channel, depending on if your increasing or decreasing the number of output channels. It's odd that it has this functionality, given the existance of 'pick'. Geoff.