How do I mute the microphone on a MacBook Air?

How do I mute the Microphone on a MacBook Air?
I am using a converting program and a USB turntable to convert my vinyl record to CD for my personal use.  During the recording session, environmental noise/room noise gets recorded at the same time via the built in microphone.  Is there anyway to mute this microphone or disable it?  I could do that on my old Toshiba with its Window program.

Turn the input volumn down all the way for the Mic. You do that in the Sound Applet In System Preferences.

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