Use a media player (e.g., VLC, Audacity, or smartphone apps like “Music Speed Changer”) to slow down difficult sentences to 0.75x or speed up to 1.25x for a challenge.

The Nihongo Sou Matome N4 series typically includes audio for:

The audio is essential for mastering pronunciation, listening speed, and natural intonation—critical for passing the JLPT N4 listening section.

This is the most reliable way to get high-quality audio.