Change sounds and voice

In Settings → Voice & Audio, choose a Voice, adjust Speed, and use Preview voice. Choose a microphone under Input. Peek can fall back to the macOS voice if its normal voice cannot play.

In Settings → General, use Speak answers out loud and Show spoken words next to the cursor. Under Sounds, control Play Peek's sounds, Also while using Peek, and Volume.

Lower other sounds while we talk briefly turns down music and video audio while you talk to Peek or hear its answer, then restores it.