doc: inform how to use USB audio in disp-sys-audio

salt/sys-audio/README.md

@@ -8,8 +8,6 @@ Audio operations in Qubes OS.
 *   [Installation](#installation)
 *   [Usage](#usage)
     *   [Audio control](#audio-control)
-    *   [Client switched it's AudioVM](#client-switched-its-audiovm)
-    *   [Client started before it's AudioVM](#client-started-before-its-audiovm)
     *   [Client turned off with a device attached](#client-turned-off-with-a-device-attached)
     *   [How to use USB devices](#how-to-use-usb-devices)
     *   [How to use Bluetooth](#how-to-use-bluetooth)
@@ -62,30 +60,17 @@ sudo qubesctl --skip-dom0 --targets=tpl-sys-audio state.apply sys-audio.install-
 ### Audio control
 
 The qube `disp-sys-audio` will be used for audio capabilities for speakers
-and microphone, with builtin modules, Jack port or Bluetooth. You are be able
-to control the volume via the volume icon that appears on the system tray.
+and microphones, with builtin modules, Jack port, USB or Bluetooth. You are be
+able to control the volume via the volume icon that appears on the system
+tray.
 
 Audio control basics:
 
 *   Left click toggles the volume; and
 *   Scrolling the mouse from left to right changes the volume;
 
 For more advanced features, right click the icon and click on `Open Mixer` or
-`Prefences`. For greater control, use the command `amixer`.
-
-### Client switched it's AudioVM
-
-If the client has already started when you decided to switch the AudioVM, you
-will need to restart the client qube until [upstream issue is fixed](https://github.com/QubesOS/qubes-issues/issues/8975).
-
-### Client started before it's AudioVM
-
-Audio will not automatically connect if the AudioVM starts after the client.
-To connect the client to audio server, restart the client's Pipewire service:
-
-```sh
-systemctl --user restart pipewire
-```
+`Preferences`. For greater control, use the command `amixer`.
 
 ### Client turned off with a device attached
 
@@ -99,7 +84,15 @@ will fail. To be able to use the device again:
 
 ### How to use USB devices
 
-Please refer to the [usage of sys-usb](../sys-usb/README.md#usage).
+It is possible to connect USB devices to `disp-sys-audio`, just attach the
+devices to the AudioVM. Note that attached devices don't take precedence over
+built-in audio. To choose which playback and recording device a qube should
+use, on `disp-sys-audio`, from the application menu, click on `Volume Control`
+or from the terminal, run `pavucontrol`. Select the `Playback` and `Recording`
+tab, find your client qube and select the wanted device.
+
+For more information, please refer to the
+[usage of sys-usb](../sys-usb/README.md#usage).
 
 ### How to use Bluetooth
 
@@ -123,6 +116,9 @@ without first starting the backend holding the USB stack. You can move the
 controller from the USB qube to the Audio qube, but this would decrease your
 system security.
 
+It may be easier to
+[use the USB qube as the AudioVM instead](../sys-usb/README.md#usage).
+
 First, start the qube holding the USB stack:
 
 ```sh

salt/sys-usb/README.md

@@ -124,9 +124,7 @@ Bluetooth and Camera are normally integrated in laptops, but they still are
 USB devices internally. They will be held by `(disp-)sys-usb` or
 `(disp-)sys-net`, else `dom0`.
 
-Built-in microphones on the other hand, are directly attached to `dom0`.
-
-To use these devices, there are two options:
+To use these devices, evaluate the following options:
 
 1.  Attaching the device (USB passthrough) to the audio client:
     *   Advantages: