This hack is sort of a fun one. It allows you to 'change' the voice in Microsoft Voice Command, by altering the voice speed. The default voice is 4, so play around a bit and entertain yourself and friends.

1. Start up your Registry Editor program. Resco is one of a few programs that will allow you to edit your Registry.

2. Find the following:
HKEY_CURRENT_USER\Software\Microsoft\Speech\Voices

3. Change the DefaultTTSRate string/value:
4 (default)

4. Increasing the number will increase the speed of the voice, while decreasing the number will slow it.