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At one extreme, if you edited the double-track to match the lead extremely closely and balanced the double-track lower in level, the listener would likely perceive a single singer with a kind of organic chorus-style effect.
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Regardless of tonal issues, though, there's the question of how many voices you want the listener to think they're hearing. SOS contributor Mike Senior replies: It depends why you're double-tracking! If you've used two different mics to enhance the tone (combining the two mics' characteristics to create a fuller timbre), the balance of the mics determines how much of each sonic character you hear. How do you pan vocals when double-tracking? Are they combined in the centre, or panned apart? And would you keep both vocal tracks at the same volume? I double-tracked lead vocals by combining two different vocal takes from the same singer, each recorded on a different mic (a Shure SM7b and an Audio-Technica AT4033a) to enhance separation and avoid any phase issues. When considering how you pan double-tracked vocals, it's important to check how the effect translates to mono - and not just because of changes in the level between mono and stereo.
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