It is sometimes helpful to create a sound recording so you can assess the quality of your microphone and sound card.  This may be particularly helpful when you suspect a problem with a microphone or whenever speech recognition doesn't seem to be working well.

Here is a link to a brief tutorial on creating a sample sound recording on a Mac.

Jon W. Wahrenberger, MD
Speech Recognition Solutions
you can use other alternatives as well to record audio on mac book.

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