Have you read and done this tutorial
HOW TO: Program the native SpeechRecognizer for Continuous Dictation and to do things ?
It contains some information that may help you program your app.
Instead of a series of nested If statements, consider an if then else coding . you now handle 70 and seventy. as separate if's; consider all your 'filtering' to use an if then else structure. You do not have to Stop the recognizer manually; see how it is done in the Parrot tutorial.
Do you want something like this or similar to this?
