Pulseaudio Setup

Set audio levels with Pavucontrol

To run the softrock server use:

pavucontrol

In order to install it, submit the following command:

sudo apt-get install pavucontrol

to choose the default pulse audio sources:

TX audio levels on the softrock server

RX audio levels on the softrock server

Make shure not to set the RX Audio level in the Recording Tab of pavucontrol to 100%. Otherwise you could have audio feedthrough from RX to TX and a distorted TX Audio. A level from 22% - 80% would be ok, but may vary on each system.

Enable Network Mode

You also need to run pulse in network mode. Use:

paprefs

In order to install it, submit the following command:

sudo apt-get install paprefs

to set up network access by checking the various option boxes.

Pulseaudio Setup independant on a X-Server installation

Make sure you add your username to the following system groups:

• pulse
• pulse-access
• audio

Use the following commands: ($USER stands for current logged in user)

sudo adduser $USER pulse
sudo adduser $USER pulse-access
sudo adduser $USER audio

Example, for the user dl6kbg the grup file must contain:

grep dl6kbg /etc/group
...
audio:x:29:pulse,dl6kbg
pulse:x:119:dl6kbg
pulse-access:x:120:dl6kbg
...

sudo nano /etc/default/pulseaudio

change settings to:

PULSEAUDIO_SYSTEM_START=1
DISALLOW_MODULE_LOADING=0

sudo nano /etc/pulse/system.pa

and add:

load-module module-native-protocol-tcp auth-anonymous=1

Restart pulseaudio:

sudo /etc/init.d/pulseaudio restart

or restart the system and fire up the softrock server. Pulseaudio runs now in systemwide mode and your softrock server should be able to establish a connection to your following dspserver.

Configure Pulseaudio Daemon

In order to use 96000 or 192000, you will need to configure pulse audio by editing:

/etc/pulse/daemon.conf

Uncomment these settings and change it for your needs.

Example:

default-sample-format = s24le
default-sample-rate = 192000

Tweak System for realtime performance

For realtime audio add the following to:

/etc/security/limits.conf

@audio - rtprio 99
@audio - memlock unlimited

and reboot and enjoy your system.