21 May
2006
21 May
'06
10:24 a.m.
James Courtier-Dutton wrote:
--
Cheers, Gene
c wrote:
That would be hardware dependent of course, but first, I need to make
the hardware work. How am I to know when grip is running and ripping a
cd that I can't hear the contents of till its been ripped, if the gain
control labeled 'cd' actually works? To me, its an extra eye candy only
control in kmix's window.
On Sat May 20, 2006 at 09:27:56AM -0500, Gene
Heskett wrote:
If you are using alsamixer to set gain levels, that currently it is kind
of hit and miss as to what 100% actually means.
On some cards 100% is 0dB gain, on others it can be +12dB gain.
So, setting your control to 100% might be causing a +12dB gain to the
signal, that of course would over drive it and cause clipping.
I will be implementing at some point, support for displaying dB gain
values in alsamixer, so the problem you are having will disappear,
because you will be able to then tell exactly what position to put the
gain slider to get 0dB gain.
James often sounding as if the playback is of a file
that over-drove the d/a in playback, or the a/d in the recording, eg clipped.
...
the ATI-IXP audio stuffs loaded
the ATIIXP
in my MSI exhibits this same issue. essentially, if the 'PCM' level is set to
100%, things are horribly overdriven. the solution is to set the Master to 100%, and
adjust volume with PCM, instead of vice versa. i guess whether this is a hardware bug or a
driver bug depends on if PCM is the last point of software contact with the stream and
master trims the levels after that, or if PCM just does some multiplication on the bits
before passing them to the Master..