10.6

83Logic Pro Instruments
• Frequency, in hertz, is represented along the y-axis from bottom to top. It is also shown
at the pointer position.
• Amplitude is represented by brightness, using shades of blue. Dark blues represent
lower amplitude values, and light blues represent higher amplitude values. Silence is
black, and the loudest amplitude is white.
• A green play position indicator scrolls across the image for the most recently triggered
voice.
• Warp markers are also shown, if the Warp button is enabled in the Main edit window.
Note: Accurate resynthesis requires a much finer frequency resolution than the spectral
display can accommodate. Frequency information depicted in the display is a coarse
representation of the underlying data. Graphical data creation and editing are performed at
the resolution of the display. This means that you cannot paint conventional melodies and
chords consisting of precise notes, for example.
Spectral editor parameters
• Draw/Mask buttons: Set a mode that affects the behavior of the paint tools.
• Draw: The paint tools can be used to modify the image itself either by drawing new
or deleting existing content or by increasing or decreasing the luminosity of specific
parts of the spectrum.
• Mask: The entire image is masked, as if covered with a layer of black wax. The paint
tools can be used to selectively reveal parts of the underlying image, as if scraping
away the wax to reveal the layer underneath.
Note: The most recent edit made in the Spectral editor can be undone by pressing
Command-Z. Multiple edits can be reversed by pressing Option-Command-Z, then
choosing the step you want to revert to from the Undo History window.
• Lasso, Brush, and Erase buttons: Choose a select (Lasso) or brush mode. Erase uses
the selected brush type to remove portions of the spectrogram.
• Lasso button: Turn on to activate a select mode. Drag across the spectral canvas to
select an area.
• In mask mode, your selection only is played. The unselected portion of the
canvas is silent.
• In draw mode, your selection can be used as a brush shape.
• Brush button: Turn on to activate brush mode. You can draw directly on the image
when in draw mode, or scrape away the mask layer to reveal the underlying image
when in mask mode. Any Lasso selection can be used as a brush shape that remains
available until you select a different brush shape. See Brush pop-up menu and field.
• Hold down Shift to limit painting to the vertical axis.
• Hold down Command to limit painting to the horizontal axis.
• Erase button: Turn on to selectively remove portions of the image with the selected
brush type. See Brush pop-up menu.
• Brush pop-up menu and field: Choose a predefined brush shape. Visible only when the
Brush or Erase button is active.
• Circle, DotBlurred, LineHorizontal, and LineVertical produce the brush shapes
described.