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Sample Alchemy additive effects in Logic Pro for iPad
Additive synthesis represents each sound as a sum of individual partials. Each partial is synthesized using a sine wave and is represented in terms of four parameters: amplitude, pitch, pan, and phase, each of which changes over time.
You can think of the additive data as a series of snapshots, each of which captures the amplitude, pitch, pan, and phase of every partial at a particular point in time. In between snapshots, each parameter updates smoothly toward the following snapshot value. When played in succession and with the right timing, the series of snapshots describes a potentially complex and continuously evolving sound.
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