Suse LINUX Professional 9.3 Update 00662644461625 User Manual
Product codes
00662644461625
13
Sound
in
Linux
Linux
‘PCM’ controls the internal volume level of digital WAVE playback. PCM is an
acronym for Pulse Code Modulation, one of the digital signal formats. This con-
trol has also an individual mute switch.
acronym for Pulse Code Modulation, one of the digital signal formats. This con-
trol has also an individual mute switch.
Other volumes, like ‘CD’, ‘Line’, ‘Mic’, and ‘Aux’, control the loopback volume
from the corresponding input to the main output. They do not influence the
recording level, only the playback volumes.
from the corresponding input to the main output. They do not influence the
recording level, only the playback volumes.
For recording, turn on the ‘Capture’ switch. This is the master recording switch.
The ‘Capture’ volume is the input gain for recording. By default, this switch is
set to zero. Choose a recording source like ‘Line’ or ‘Mic’. The recording source is
exclusive, so you cannot choose two of them at the same time. ‘Mix’ is a special
recording source. You can record the currently played signal from this source.
The ‘Capture’ volume is the input gain for recording. By default, this switch is
set to zero. Choose a recording source like ‘Line’ or ‘Mic’. The recording source is
exclusive, so you cannot choose two of them at the same time. ‘Mix’ is a special
recording source. You can record the currently played signal from this source.
Depending on the AC97 codec chip, special effects, like 3D or bass/treble, are
available, too.
available, too.
SoundBlaster Live! and Audigy Family
SoundBlaster Live! and SB Audigy1 have numerous mixer controls for their
AC97 codec chip and DSP engine. In addition to the controls already described,
they have ‘Wave’, ‘Music’, and ‘AC97’ volumes to control the internal signal rout-
ing and attenuation for PCM, WaveTable MIDI, and AC97 mixing. Keep the vol-
ume at 100% to hear all of them. SB Audigy2 (depending on the model) has less
controls than SB Live, but still has ‘Wave’ and ‘Music’ controls.
AC97 codec chip and DSP engine. In addition to the controls already described,
they have ‘Wave’, ‘Music’, and ‘AC97’ volumes to control the internal signal rout-
ing and attenuation for PCM, WaveTable MIDI, and AC97 mixing. Keep the vol-
ume at 100% to hear all of them. SB Audigy2 (depending on the model) has less
controls than SB Live, but still has ‘Wave’ and ‘Music’ controls.
The recording on SB Live is similar to on-board chip. You can choose ‘Wave’
and ‘Music’ as the additional recording source to record the played PCM and
WaveTable signals.
and ‘Music’ as the additional recording source to record the played PCM and
WaveTable signals.
USB Audio Devices
USB audio devices usually have a small number of mixer controls. Sometimes
they even have none at all. Most devices either have a ‘Master’ or ‘PCM’ control
switch to control the playback volume.
they even have none at all. Most devices either have a ‘Master’ or ‘PCM’ control
switch to control the playback volume.
13.1.5
The Mixer for the Sound Chip Envy24
envy24control is a mixer application for sound cards using the Envy24 (ice1712)
chip. The flexibility of the Envy24 chip can result in varying functionalities
in different sound cards. The latest details on this sound chip are available in
chip. The flexibility of the Envy24 chip can result in varying functionalities
in different sound cards. The latest details on this sound chip are available in
/usr/share/doc/packages/alsa-tools/envy24control
.
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