SlowJapanese is the name of this app.
You can listen Japanese radio in slower/faster tempo.
It's useful for educational purpose.
2021.08
Experimentally added an Auto Subtitle function using Google Speech Recognizer.
You can also check your own pronunciation with it.
※Google App is needed to be activated and set the default recognizing language to Japanese.
Details are here.↓
http://yasoo7964.web.fc2.com/android_SlowJapanese_ActivateSpeechRecognizer.html
※Depending on the system, the radio sound may be played as follows.
・when headset plugged : 'VOICE CALL'
・when headset unplugged : 'ALARM SOUND'
So please tweak each when you wanna up/down the radio volume.
*For smartphones with battery saving mode,
Auto-startup and background services may not work correctly.
In that case, Please allow it yourself from the individual app settings on the system settings menu.
Bug fixed.