Clarify Speech in MP4

I have an MP4 that runs under five minutes. The visuals don’t matter—I only need the spoken words to be crystal-clear. Right now the track is buried under background noise, the volume is uneven, there is a hint of distortion, and the speaker talks a little too fast to follow.

Your task is to extract the audio, clean it up so every word is intelligible, and slow the speech just enough to aid comprehension without sounding unnatural. When you’re done, please deliver the restored audio as a high-quality WAV or lossless format plus a version seamlessly re-synced back onto the original video for reference.

I’ll review by listening for:
• Minimal residual noise
• Consistent, comfortable volume
• Natural-sounding slowdown with no pitch shift or artifacts

Let me know which tools you intend to use and your estimated turnaround time so we can get started right away.