My line in sound doesn't seem to work, what's wrong with it?

I've tried plugging in several mircophones with 1/8" jacks ( I think that is the small standard headphone ones.) The thing is none of these work. The problem is they all say they work with mac. I need to get one of these to work. I've  gone to the system prefs and go to the sound settings and I don't get any farther in my mission to get this to work. Please and thank you to the help I get.

Hi
First up when you go into Speech you are using the built-in microphone which has sufficient 'gain' in the circuit in order to work.
When you plug an external microphone into your PB you are actually plugging a microphone into a 'line input' that is an input designed to accept signals at 'line' level not microphone level. So you either need to get yourself a microphone amp to boost the signal before the input to the PB or a 'line' level microphone. Same thing really except the amp is included in the microphone.
Hope that helps.
Phil

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