If you cannot hear sound while using MPfm, try one of the following solutions:
Check if the sound works using another application
Open Control Panel and click on the Sound icon.
Right-click on the device and click on the Test menu item.
If the test fails, it means that there is a problem with your Windows sound configuration. You need to fix this problem before being able to use MPfm.
Try a different driver
If a specific driver doesn't work, you can try using another one (DirectSound, ASIO, WASAPI).
Click on the Windows > Settings menu item.
Click on the Audio tab, change the audio configuration and test the new settings.
If none of the drivers work, check your Windows audio configuration. If the drivers work but you can't hear anything, check your volume.