Open the set to which you want to add vocals in Ableton Live. If you want to start from a new, blank set, click "File," then "New Live Set." Press "Tab" to switch to Arrangement View.
Click one of the three folder icons on the far left of the Ableton window. Navigate to the folder containing the recorded vocals you want to edit. Drag and drop the vocal onto the track labeled "1 Audio." Right-click in an empty area of the Ableton workspace and select "Off" in the "Fixed Grid" section.
Click and drag the mouse pointer over the first word or phrase that you want to separate. Press "Ctrl" and "E" simultaneously to cut the portion into its own clip. Repeat the process for the rest of the vocal. To preview the vocal at any time, click the "Play" button at the top of the window or press the spacebar.
Crop the clips when you're finished separating them. Right-click the "1 Audio" label, then click "Select Track Content." Right-click any of the clips and choose "Crop Clip(s)." Click and drag the separated vocal clips to rearrange them as desired.
Click the first clip in the track. Press "Shift" and "Tab" together to open the clip's waveform view if it doesn't open automatically. Click the "Volume" button to reveal the vocal clip's volume envelope. Right-click the waveform and select "Off" under "Fixed Grid."
Press "Ctrl" and "B" simultaneously to enable the pencil tool. Click and drag the pink volume line on the clip to lower the volumes of any unwanted noises, breaths or interference in the vocal recording. To zoom in on a portion of the vocal, move the mouse to the top of the waveform; the cursor will change to a magnifying glass. Click and drag downward to magnify the waveform.
Click the "Live Devices" icon next to the file browser. Click the arrow next to "Audio Effects" to expand the section, then drag and drop the "EQ Three" icon onto the vocal track. Adjust the "GainLow," "GainMid" and "GainHi" knobs to bring out different frequencies in the vocals.