Audio config

Install jackd1 (not jackd2 since it depends on dbus, meh). Make sure to enable rtprio and memlock permissions, the jackd installer on debian asks for this.

Put this in /etc/environment

export JACK_PROMISCUOUS_SERVER=""

Make a new file /root/jackd_start, chmod to 755 and put this in it:

#!/bin/bash

#make sure jackd and bobdsp are terminated when this script ends
cleanup()
{
  killall jackd
  killall bobdsp
  exit 0
}
trap cleanup SIGINT
trap cleanup SIGTERM

#JACK_PROMISCUOUS_SERVER is exported here and in /etc/environment
#this tells jackd and libjack to use /dev/shm/jack instead of /dev/shm/jack-<uid>
#and to set the permissions to 777, however umask needs to be set to 0 first
export JACK_PROMISCUOUS_SERVER=""

#allow rtprio and mem locking
ulimit -l unlimited
ulimit -r 95

#start bobdsp
su -l bitlair -c "cd /home/bitlair/bobdsp; ./build/bobdsp -f -d"

#start jackd with -l passed to su to make the environment a login shell, restart when it dies
#jackd needs to run as root, probably because it needs to send signals to its clients
while [ 1 ]
do
  su -l -c "mkdir ~/.jackd; umask 0; jackd -R -d alsa -d jack51 -r 48000 -p 1024 -n 2 -i 2 -o 6 2>&1 | tee ~/.jackd/jackd.log" || true
  sleep 1
done

Put this in /etc/rc.local

/root/jackd_start&

At the top of /etc/init.d/mpd change

#!/bin/sh

to

#!/bin/bash

Then change

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

into

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

#JACK_PROMISCUOUS_SERVER is exported here and in /etc/environment
#this tells jackd and libjack to use /dev/shm/jack instead of /dev/shm/jack-<uid>
#and to set the permissions to 777
export JACK_PROMISCUOUS_SERVER=""

#allow rtprio and mem locking
ulimit -l unlimited
ulimit -r 95

Use this /etc/asound.conf file

pcm.!default {
    type plug
    slave { pcm "jack" }
}

pcm.jack {
    type jack
    playback_ports {
        0 system:playback_1
        1 system:playback_2
        2 system:playback_3
        3 system:playback_4
        4 system:playback_5
        5 system:playback_6
    }
    capture_ports {
        0 system:capture_1
        1 system:capture_2
    }
}

ctl.mixer0 {
    type hw
    card 0
}

ctl.jack51 {
    type hw
    #card 0
    card Audigy
}

pcm.jack51 {
    # "asym" allows for different
    # handling of in/out devices
    type asym
    playback.pcm {
         # route for mmap workaround
         type plug
         slave.pcm "surround51:CARD=Audigy"
         #slave.pcm "surround51"
         slave.channels 6
         route_policy duplicate
    }
    capture.pcm {
        # 2 channels only
        type hw
        #card 0
        card Audigy
    }
}

In /etc/mpd.conf comment the current audio output, and use this instead:

audio_output {       
       type    "jack"       
       name    "mpd"     
}