Audacity+Tools

=Control Toolbar - Audio Control Buttons=
 * [[image:http://audacity.sourceforge.net/onlinehelp-1.2/images/button_skipstart.png width="48" height="48"]] || Skip to Start - moves the cursor to time 0. If you press Play at this point, you project will play from the beginning. ||
 * [[image:http://audacity.sourceforge.net/onlinehelp-1.2/images/button_play.png width="48" height="48"]] || Play - starts playing audio at the cursor position. If some audio is selected, only the selection is played. ||
 * [[image:http://audacity.sourceforge.net/onlinehelp-1.2/images/button_loop.png width="48" height="48"]] || Loop - if you hold down the Shift key, the Play button changes to a Loop button, which lets you keep playing the selection over and over again. ||
 * [[image:http://audacity.sourceforge.net/onlinehelp-1.2/images/button_record.png width="48" height="48"]] || Record - starts recording audio at the project sample rate (the sample rate in the lower-left corner of the window). The new track will begin at the current cursor position, so click the "Skip to Start" button first if you want the track to begin at time 0. ||
 * [[image:http://audacity.sourceforge.net/onlinehelp-1.2/images/button_pause.png width="48" height="48"]] || Pause - temporarily stops playback or recording until you press pause again. ||
 * [[image:http://audacity.sourceforge.net/onlinehelp-1.2/images/button_stop.png width="48" height="48"]] || Stop - stops recording or playing. You must do this before applying [|effects], saving or exporting. ||
 * [[image:http://audacity.sourceforge.net/onlinehelp-1.2/images/button_skipend.png width="48" height="48"]] || Skip to End - moves the cursor to the end of the last track. ||

=Control Toolbar - Mixer Toolbar=

The Mixer Toolbar has three controls. The leftmost slider controls the playback volume. The middle slider controls the recording volume and the rightmost option lets you choose the input source (such as "Microphone", "Line In", "Audio CD", etc.).

Changing these controls has no effect on the audio data in your project - in other words it doesn't matter what the output volume level is when you Export or Save a project - the end result is the same.

Source: http://audacity.sourceforge.net/onlinehelp-1.2/reference.html#toolbar_control