The Tapping dialog lets you arrange bar-lines by ear.
The Tapping Dialog is brought up by clicking on the Tapping button 
on the Misc Tool Panel or by selecting the menu item "Tool->Tapping Tool".
Playback
Audio – Upon selecting this item during bar-line arrangement the initial audio file is played back.
MIDI - Upon selecting this item the recognition result is played back.
Start - Launches play.
Stop - Stops play.
The arrangement of bar-lines is accomplished with the aid of spacebar, or with the corresponding buttons in the centre of the dialog. You may also launch play with the spacebar.
Show Current Position - Enables the play position indicator. This setting should not be used on slow computers.
You can read about arranging bar-lines in more detail in the section entitled Bar-Lines.