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I can playback my guitar through the mic in once I've recorded something, but I can't hear the guitar in real-time as I could in Windows?

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Try rakarrack for some cool effects – Kris Jun 3 '15 at 3:16

give alsamixer command in terminal, move with arrow to the microphone and press M to unmute it.

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You saved my life. – Evandro Silva Nov 17 '12 at 16:46

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