Update README.md

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@ -162,6 +162,8 @@ Thanks for your donation! We'll get the greatest power from your encourage!
[- 3-16.6 How to upgrade Docker-CE](./README.md#3-166-how-to-upgrade-docker-ce)
[- 3-16.7 Change audio mono output to stereo for Desktop Version System](./README.md#3-166-how-to-upgrade-docker-ce)
[3-17. Extra Application Instructions](./README.md#3-17-extra-application-instructions)
[- 3-17.1 WPS Office Arm 64-bit Desktop Installation Note](./README.md#3-171-wps-office-arm-64-bit-desktop-installation-note)
@ -1286,6 +1288,34 @@ apt update
apt upgrade
```
#### 3-16.7 Change audio mono output to stereo for Desktop Version System
Edit the file **/usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf**
Add the ";" symbol at the beginning of each line of the following content to comment out the following:
```
[Mapping analog-mono]
device-strings = hw:%f
channel-map = mono
paths-output = analog-output analog-output-lineout analog-output-speaker analog-output-headphones analog-output-headphones-2 analog-output-mono
paths-input = analog-input-front-mic analog-input-rear-mic analog-input-internal-mic analog-input-dock-mic analog-input analog-input-mic analog-input-linein analog-input-aux analog-input-video analog-input-tvtuner analog-input-fm analog-input-mic-line analog-input-headset-mic
priority = 7
```
The following is the content after the comment:
```
;[Mapping analog-mono]
;device-strings = hw:%f
;channel-map = mono
;paths-output = analog-output analog-output-lineout analog-output-speaker analog-output-headphones analog-output-headphones-2 analog-output-mono
;paths-input = analog-input-front-mic analog-input-rear-mic analog-input-internal-mic analog-input-dock-mic analog-input analog-input-mic analog-input-linein analog-input-aux analog-input-video analog-input-tvtuner analog-input-fm analog-input-mic-line analog-input-headset-mic
;priority = 7
```
Finally restart the system to take effect.
### 3-17. Extra Application Instructions
#### 3-17.1 WPS Office Arm 64-bit Desktop Installation Note