Modify the rate of the speech.
When I wake up, (I speak quite slowly)[rate:"x-slow"].
I can combine (multiple values)[pitch:"low";rate:"slow";volume:"loud";voice:"Brian"] at once.
Possible values:
n/a
When I wake up, (I speak quite slowly)[rate:"x-slow"].
I can speak with my normal pitch, but also with a much higher pitch.
<speak>
When I wake up, <prosody rate="x-slow">I speak quite slowly</prosody>.
</speak>
<speak>
When I wake up, <prosody rate="x-slow">I speak quite slowly</prosody>.
</speak>