Using I Logic Next Free v1.1 as an example it's done like this:
Default Layout:
- uses a solid background image with 2 mostly transparent rectangular areas at the top and bottom to give the track color strips or blocks.
The solid or non-transparent image blocks the color so it's only being shown in the color strip at the top and color block at the bottom.
Default Color layout:
- uses a partially transparent background image with 2 mostly transparent rectangular areas at the top and bottom to give the track color strips or blocks.
The color for most of the track will be darker than what is shown in the color strip at the top and color block at the bottom.
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