SABLE is XML-style markup language ([7]). The various
tags
of SABLE allow the modification of many properties of the speech output. 
For example, the speech rate can be modified: 
<RATE SPEED="+100%"> Wir koennen schnell sprechen
  </RATE>
The volume can be altered, too: 
<VOLUME LEVEL="quiet"> Das ist leise </VOLUME>
For the complete tagset see [8].
You may synthesize a SABLE file as follows: 
(tts "example.sable" 'sable)
Many SABLE tags are not yet working properly. Currently we are in the process of implementing these tags for German and English.