Audio

Table of Contents General ALSA Pulse Heatheck Set device Input (source) Output (sink) default Modules

General

If you need audio editing, you need a:

• real-time kernel;
• using JACK instead of PulseAUdio.

ALSA

ALSA: Advanced Linux Sound Architecture, API for sound card device drivers The sound servers PulseAudio work on top of ALSA and implements sound card device drivers.

overview here

General:

• restart: sudo alsa force-reload

Pulse

General:

• GUI is pavucontrol

Heatheck

General:

• check if running: pulseaudio --check
• stop pulse: pulseaudio -k | --kill
• show logs: pulseaudio -v | --verbose
• start as service: systemctl --user restart pulseaudio.service
• start (?): pulseaudio -D | --daemon
• if problem persists, restarts ALSA

Set device

From here

Input (source)

List:

• get: pactl list short source
• set default for current session (lost at reboot): pactl set-default-source'<SOURCE_NAME>'

Output (sink)

List:

• get: pactl list short sinks
• set default for current session (lost at reboot): pactl set-default-sink '<SINK_NAME>'

default

Steps:

• get input/output number using
  • pactl list short sinks
  • pactl list short sources
• edit system pulse confsudo vi /etc/pulse/default.pa
• uncomment the following lines

### Make some devices default
#set-default-sink output
#set-default-source input

• replace output/input by their values

### Make some devices default
set-default-sink 1
set-default-source 2

• delete user pulse config rm -rf ~/.config/pulse
• reboot

Modules

General:

• list modules: pactl list short modules
• load module: pactl load-module <MODULE_NAME>
• unload module: pactl unload-module <MODULE_NAME>

Modules:

• loopback (hear your voice>: pactl load-module module-loopback latency_msec=1