1. Install Apple Speech Recognition and Applescript.
2. Drag all of the scripts from the "Drag to Speakable Items" folder to the "Speakable Items" folder in your Apple menu. These scripts are the phrases used to control the HearCalc calculator. You can rename these scripts, or make your own. (See below)
3. Start Speech Recognition from the Speech control panel.
4. Start HearCalc.
5. Start speaking to your Mac.
AppleScripting
HearCalc is Apple-scriptable (That's how speech recognition works anyway!). To view the possible commands, open the HearCalc dictionary in the Script Editor. HearCalc responds to the following commands: