RE: [tlug] How to change IRQ address for a sound card?

[<burlingk@example.com>]

> -----Original Message-----
> From: tlug-bounces@example.com [mailto:tlug-bounces@example.com Behalf Of
> Stephen J. Turnbull
> Sent: Monday, October 01, 2007 2:51 PM
> To: Tokyo Linux Users Group
> Subject: Re: [tlug] How to change IRQ address for a sound card?
> 
> 
> Dave M G writes:
> 
>  > Yes, I know what you mean. Like I said, it only 
>  > has  "PCM" and "Front" 
>  > volume which adjust overall volume (not sure about
>  > their relationship to each other).
> 
> "Front" is probably "Master".
>

Most likely.  If "Front" controls them all, then yeah.

<snip>

> If Ken's guess about this is right, sources are important.  Basically
> (unless you know your application requires other treatment) you want
> to keep the pipeline at as high volume as possible throughout without
> distortion, and control volume as late as possible. 
> 

Exactly.  Basically, "PCM" is like saying "WAV".  It is at an almost
purely software level.  Everything will be run through the filters that
the drivers use to control volume.  "Front," or "Master," or "Main" will
refer to the level of control that interacts almost directly with the
hardware.  Like he said, it controls the main pipeline.

Think of it like the difference between Optical and Digital Zoom
on a digital camera.  Optical zoom is sweet.  It's the real deal,
and the clarity can't be beat.  Once the optical zoom reaches it's limits
the digital zoom will run things through filters and basically rescale
the image.

Some software tries to do just that when the settings for main are
too low, so you want it to be higher so that there is a clean signal
to play with.  You don't want it too high though, unless you have some
well built speakers, because even a silent line still sends out a feed.
That feed is at the very least agitating.  Basically, never want to turn
the sound ALL the way up. :-)

-- 
Ken