In order to disable caching of speech resources by MSS, please follow these procedures on your web servers(s):

1. Open your IIS config console
2. Right-click the application directory and click "Property"
3. Click the "HTTP Headers" tab
4. Enable "Enable content expiration"
5. Check the "expire immediately" radio button
6. Click "OK"

This is recommended on an as-needed basic for deveopment environments and this is not recomended for production environments.