AZ screen recorder is among the best apps for screen recording in android devices. It has a lot of following for its ability to record the screen, but actually, it can also record the system audio which very few people know. After you download and install the application from the Google Play store, launch it you will see a bubble floating. Tap on the bubble and click on the settings gear icon to tweak its settings.
In the options, scroll down to find the option record audio and click on it, then move the slider to turn it on. You don’t have to change any video recording settings as you are only concerned about the system’s audio recording, you are done with the settings.
Now just leave the app and click on the bubble icon of the AZ screen recorder, to start the audio recorder, just tap on the red video record button and do what you want to record, after you are done, just pull the notification bar down and tap on stop to stop and save it.
Remember that the application records the audio through your device’s microphone, so avoid any noises in the background.
Thus you can simply record the system audio of your android devices using this screen recorder tool, you can transfer them to the system if you want.