[ardour-dev] Fader gain

[David]

On Fri, 17 Mar 2006 15:30:12 +0000
John Rigg <j at sound-man.co.uk> wrote:

> On Fri, Mar 17, 2006 at 02:37:31AM +0100, David wrote:
> > On Thu, 16 Mar 2006 23:29:01 +0100
> > fons adriaensen <fons.adriaensen at skynet.be> wrote:
> > 
> > > Then I added a
> > > mono track and recorded a sine wave at -20dB. For playback
> > > this track goes through the master strip. The fader for the
> > > new track attenuates by twice the dB value indicated, and the
> > > fader in the bus strip behaves normally...
> > 
> > Isn't that due to the mono->stereo division ? I imagine that sending
> > two copies of the mono channel at the initial gain to the master bus
> > would give a volume twice as loud. Am I wrong ?
> 
> Yes. Twice the signal level is a +6dB increase. 20dB attenuation
> is a reduction to 1/10, 40dB attenuation is a reduction to 1/100
> of previous level.
> 
> dB = 20log(signal2/signal1) where signal level is measured in volts
> or, as here, a digital representation of a voltage.

Ahem, yes. Sorry, I read the initial post too fast and probably too
late.

> John

-- 
David