Make the lead performance solid
Double tracking works best when the lead is clear and controlled. A second take should reinforce the performance rather than compensate for an unfocused lead.
Record the lead first, comp the best phrases and then perform the double while listening to the lead through headphones.
Match timing and pronunciation
Differences in consonants and word endings can make doubles sound messy. Focus on matching the rhythm and articulation rather than copying every breath.
Pay close attention to the start and end of phrases, especially plosives and sibilants that can become obvious when layered.
Choose where doubles belong
Doubling every line can reduce intimacy and clarity. Use layers where they support emphasis, width or energy.
Try doubles on the hook or key words, then leave more exposed verse lines centred on the lead.
Balance and edit conservatively
Small timing edits can tighten a double, but over-editing may remove the natural movement that makes the performance feel alive.
Listen in mono and stereo, adjust the double level and edit only the mismatches that distract from the lyric.