Forward all ALSA output to Pulseaudio

• Install the Pulseaudio-plugin for ALSA. The name of this package is libasound2-plugins.
• Modify/create the file /etc/asound.conf to/with the following content:

pcm.!default
{
  type pulse
}
ctl.!default
{
  type pulse
}

• Reboot the PC.