Question 1

When should I use WAV instead of MP3?

Accepted Answer

Use WAV when you'll further process/edit the audio, for broadcast/professional use, or when file size isn't a concern. For web streaming or mobile apps, MP3 is usually better.

Question 2

What sample rate should I request?

Accepted Answer

22050Hz is standard for speech and sounds natural. 44100Hz (CD quality) is available for premium quality. Higher sample rates increase file size without audible benefit for speech.