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To add depth to vocals, you can employ various techniques such as double tracking, layering harmonies, using effect processors like reverb and delay, and subtly adjusting the pitch and timbre. Below, I will explain these techniques in detail:

1. Double Tracking: Record the vocal part twice and mix both tracks together. The second take should be as close to the first one as possible in terms of timing, intonation, and expressive nuance. This technique can create a thicker, more spacious sound and mask small imperfections in the original take.

2. Layering Harmonies: Create additional vocal parts in harmony with the lead vocal. These can be simple parallel harmonies, or more complex counter-melodies. The use of harmonies can add richness and depth to the vocal sound and create a fuller, more interesting texture.

3. Using Reverb: Reverb is a natural part of