You can connect a mic and mix your voice, or the sound of the instrument you are playing, with the track being played back.
Connecting a mic
1.Connect a mic to the MIC IN jack.
2.Adjust the mic volume with the INPUT dial.
Mic
Contact mic attached to an instrument
Practicing with track as they play
If you sing or play an instrument while a track is playing back, you can hear the combined signals of your voice or the instrument output through the 
/LINE OUT jack.
Use the MIX BALANCE keys to adjust the balance between the track being played back (PLAYBACK) and the mic (MIC) signals.
15TASCAM