$cat /proc/asound/devices
2: : timer
3: : sequencer
4: [ 0- 2]: digital audio capture
5: [ 0- 1]: digital audio playback
6: [ 0- 1]: digital audio capture
7: [ 0- 0]: digital audio playback
8: [ 0- 0]: digital audio capture
9: [ 0- 0]: hardware dependent
10: [ 0] : control
$
devices
Lists the ALSA native device mappings.
A music sequencer is a musical application or a device designed to
play back musical notation. The original kind of sequencer is now
known as a step sequencer to distinguish it from the modern kind,
which records a musician playing notes.
GNUsound - A sound editor for Linux/x86. It supports multiple tracks,
multiple outputs, and 8, 16, or 24/32 bit samples. It can read a
number of audio formats through libaudiofile, and saves them as WAV.
GNU sound
Digital audio uses pulse-code modulation and digital signals for sound
reproduction. This includes analog-to-digital conversion (ADC),
digital-to-analog conversion (DAC), storage, and transmission. In
effect, the system commonly referred to as digital is in fact a
discrete-time, discrete-level analog of a previous electrical
analog. While modern systems can be quite subtle in their methods, the
primary usefulness of a digital system is the ability to store,
retrieve and transmit signals without any loss of quality.
Intel's use of the phrase audio codec refers to signals being
encoded/decoded to/from analog audio from/to digital audio, thus
actually a combined audio AD/DA-converter. This should not be confused
with a codec in the sense of converting from one binary format to
another, such as an audio (MP3) or video (Xvid) codec in a media
player.
A timer is a specialized type of clock. A timer can be used to control
the sequence of an event or process. Whereas a stopwatch counts
upwards from zero for measuring elapsed time, a timer counts down from
a specified time interval, like an hourglass. Timers can be
mechanical, electromechanical, electronic (quartz), or even software
as all modern computers include digital timers of one kind or
another. When the set period expires some timers simply indicate so
(e.g., by an audible signal), while others operate electrical
switches, such as a time switch, which cuts electrical power.