From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Courtier-Dutton Subject: Re: Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII Date: Thu, 18 Feb 2010 10:11:02 +0000 Message-ID: References: <20100216143200.GB25489@tango.0pointer.de> <20100216210703.GA18109@tango.0pointer.de> <20100216223938.GA23623@sirena.org.uk> <20100216224212.GA1486@tango.0pointer.de> <20100216233825.GB23623@sirena.org.uk> <20100216235658.GA6766@tango.0pointer.de> <4f3252891002171748tdcaa87n4d11d9880c0043e3@mail.gmail.com> <20100218023742.GC23637@tango.0pointer.de> <4f3252891002172215j7b85313ci3626a1bdad5c040c@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Received: from mail-fx0-f225.google.com (mail-fx0-f225.google.com [209.85.220.225]) by alsa0.perex.cz (Postfix) with ESMTP id 2551E1038B4 for ; Thu, 18 Feb 2010 11:11:03 +0100 (CET) Received: by fxm25 with SMTP id 25so1065827fxm.32 for ; Thu, 18 Feb 2010 02:11:02 -0800 (PST) In-Reply-To: <4f3252891002172215j7b85313ci3626a1bdad5c040c@mail.gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Raymond Yau Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On 18 February 2010 06:15, Raymond Yau wrote: >> >> > VLC media player has a slider from 0% to 300% , so the user are easily to > know =A0100% is the point which there is no software gain and no software > autentation > I would have thought that VLC should have used dB for the gain. In that case 100% =3D=3D 0dB. What would 50% be? -6dB ? As sound volumes are not linear, they are exponential, the dB logarithmic scale is the best one to use. The 0dB point is fairly easy for a user to understand. I find it easier to understand that %