It's Your Plane FS9, FS2004 and FSX Speech Recognition Cockpit Control

You can create your own Voice Commands and cause the recognition of the spoken phrase to activate a Keyboard key stroke or key combination. This functionality has been implemented so that you can use your own unique voice commands to execute simulated keyboard keystrokes to extend the IYP application and/or control other add-ons.

Example: Interfacing the FS Add-On, FSDiscover!
For example, let's say that you have purchased and installed the flight simulator add-on, FSDiscover! and you wish to control 5 of its functions with voice commands, namely:

Creating Voice Commands That Do Not Conflict
You need to ensure that whatever voice command you create DOES NOT CONFLICT with the existing IYP voice commands. The easiest way to accomplish this is to speak a specific phrase and see if the IYP program detects it. For example, if you say, "geographic names" a few times and the IYP application does not react in any way, then you can be pretty sure that this unique phrase can safely be used. Keep in mind a lot depends on how much voice training you have done beforehand.

Implementing the Voice Commands
Using the example above, you would minimize your flight simulator so that you can see the IYP application panel and click on the "Options" button. You would enter the phrase “Geographic Names” into the Phrase text box, place checks in the checkboxes Ctrl and Shift, select the key F10 from the Key Assignment list, then press Save. You repeat the above sequence to add other commands. Once you are done creating your voice commands, press Close Options Panel. This will cause the IYP program to do a Restart Cold and Dark and you are ready to test out your new voice commands.

F S Navigator
If you are using FS9 and have FSNavigator installed, you can use the voice command "F S Navigator" (or any other phrase you desire), leaving the Ctrl, Alt, Shift and Tab checkboxes unchecked, selecting F9 from the Key Assignment list and pressing Save, then press Close Options Panel.