improved documentation

docs/additional_audio_settings.md

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+# Additional Audio Settings
+
+This document is still in an early stage and will be updated soon.
+
+## Pipewire:
+
+tbd
+
+## Pulseaudio:
+
+### Acoustic Echo Cancellation:
+
+Enable the echo cancel PulseAudio module:
+
+``` sh
+pactl load-module module-echo-cancel \
+  aec_method=webrtc \
+  aec_args="analog_gain_control=0 digital_gain_control=1 noise_suppression=1"
+```
+
+Verify that the `echo-cancel-source` and `echo-cancel-sink` devices are present:
+
+``` sh
+pactl list short sources
+pactl list short sinks
+```
+
+Use the new devices:
+
+``` sh
+# The device names may be different on your system.
+# Double check with --list-input-devices and --list-output-devices
+python3 -m linux_voice_assistant ... \
+     --audio-input-device 'Echo-Cancel Source' \
+     --audio-output-device 'pipewire/echo-cancel-sink'
+```