Pulseaudio

record several sources.

Audiosink with several sources.

#!/bin/bash

### This script sets up two loopback virtual devices and a null sink
### which can then be used to mix inputs and record the result.
### It requires a functioning PulseAudio installation and also
### PulseAudio Volume Control to manage the streams.
# License: GPL 2 or later
# Author: clareoldie
# Date: June 1st 2012


set -x
unload-modules () {
### First detect then unload loopback devices
for i in $(pactl list | grep -B 1 'Name: module-loopback' | grep 'Module #' | cut -d '#' -f 2-)
do
pactl unload-module $i
done
### Next detect and unload the Null-Sink device/s
for i in $(pactl list | grep -B 1 'Name: module-null-sink' | grep 'Module #' | cut -d '#' -f 2-)
do
pactl unload-module $i
done
}

load-modules () {
### Load required modules
pactl load-module module-null-sink sink_name=MySink
pactl load-module module-loopback sink=MySink
pactl load-module module-loopback sink=MySink
}

test-modules () {
## If the modules exist 0$?=0 then unload them, else load them.
pactl list | grep -B 1 'Name: module-loopback'
if [ "$?" = "0" ]
then
unload-modules
exit 0
fi
pactl list | grep -B 1 'Name: module-null-sink'
if [ "$?" = "0" ]
then
unload-modules
exit 0
else
load-modules
fi
}

### Main Programme
test-modules

http://www.pclinuxos.com/forum/index.php/topic,105968.0.html