There are several ways to record sound on the Mac depending on the type of sound you want to record. The easiest free way is to use Quicktime Player. Open QuickTime and select "New Audio Recording" from the File menu. Click the control button to start recording. Click it again to stop. Play the recording and if you like it, save it.
This uses the built-in microphone, so the quality is not as good as a professional setup.
You can check your mac sound system fist or bring it to a repairing shop.
Use a device called the iMic if you are trying to connect to a mac. It works perfectly.
Click on the red record button at the bottom of the screen. Just talk to your Mac as if you were speaking to a person. It will record your voice. Afterwards you can change the way your voice sounds and tones.
http://www.ehow.com/how-does_4620483_vinyl-record-sound-compared-cd.html
What ships with the machine are Quicktime and iMovie. There a a number of websites that have Apps that are Mac compatible and record videos and a freeware.
How to record over the air antenna program
Fleetwood Mac
The Logitech G430 can be used with a Mac. However, you will not have the full experience of surround sound. Currently there is no software to install for Mac to have the full surround sound effect.
Go to insert, go on sound, then underneath put record sound.
If you have Mac OS X 10.6 (Snow Leopard) then QuickTime can record the screen - select New Screen Recording from the File menu. Try Snapz or screenflow, both of them record screen for Mac. or check more at http://en.wikipedia.org/wiki/Screencast
I think that it can record for 1 minute but there are some tricks which can record sound for more than that!
Windows Sound Recorder