10.6

75Logic Pro Instruments
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.
Note: Phase is not an independent parameter. The phase of a partial at any moment in
the evolution of a sound is determined by the phase at the start point of the sound and by
the (possibly changing) pitch of the partial. Because pitch information is captured in each
snapshot, it isn’t necessary for phase information to be captured in the same way. The
phase of each partial is specified only at the absolute start point of the sound.
The Additive edit window shows additive data in two graphical displays.
• Partial bar display: Shows a series of vertical columns, or bars. Levels represent the
amp, pitch, pan, or phase values of individual partials or partial groups, depending on
the chosen display mode. See Logic Pro Alchemy partial bar display.
• Partial envelope: Shows a number of points that operate in two ways, depending on the
chosen display mode. See Logic Pro Alchemy partial envelope.
Logic Pro Alchemy partial bar display
Source components are shown only in advanced view. Click the Advanced button to
switch to advanced view, then click the A/B/C/D button to view detailed parameters for the
selected source.
The source edit window is opened by clicking the Edit button on any source subpage. Click
the close window icon (X) at the top right to close the window.
Use the Additive button at the top of the Main edit window to open the Additive edit
window.
The Partial bar display shows up to 600 partials with independent amplitude, pitch, pan,
and phase values at each Partial envelope point. You can edit individual partials or groups
of related partials for each envelope point.