The CSIX Series continues to evolve through steady updates, expanding features, refining behavior, and adapting to new developments in REAPER itself.

Each release brings improvements not only to visual design and layout logic, but also to how theme resources are structured and function behind the scenes.

While many of the changes below focus on the latest – and extremely versatile – AE Series, these updates often extend to other theme variants as well, ensuring cohesiveness across the entire line.

As always, the goal is to improve the CSIX experience while keeping pace with REAPER’s evolving capabilities.

Explore highlights from recent updates below.

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Fixed FX and Sends Columns
The AE Series now include an alternate TCP layout in which FX Inserts and Sends are always displayed as two dedicated columns on the right. The layout can be used in B-format (fixed control area) or C-format (flow).

Columns and width can be tweaked further from the Adjuster:

Tip:
In the Adjuster you can also define assignments for the extended mixer and choose whether FX-parameters are shown only when the track is selected. If using REAPER developer versions ↗︎ this setting also allow experimentation with movable/empty slots.

The InfoBlock showing contextual information such as Record Settings, Track Routing or TimeBase, can be enabled via the TRACK INFO setting.

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Reset Assigned Track Layouts
Reset track layouts to their fallback defaults. These defaults can also be configured in the Adjuster.

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MyMod: Adjust Text Size
Track titles, inserts, and other labels can be resized in 1-point increments. Click to increase the size, or Shift-click to decrease it. Usually only a few steps are needed.

Font sizes are saved automatically to the theme and remain preserved if you repack the mod. Before making changes, unpack the theme in MyMod:

MyMod can also adjust minimum track heights. Increasing the track height gives larger titles more visual room, while reducing the text size helps fit longer names. Since fonts may render differently, you can also fine-tune sizes until they look right.

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Coloring in CSIX
The Adjuster has several added options for coloring both tracks and media. For convenience, selected coloring actions are available right at hand e.g. resetting tracks or items to default appearance (unassigned). Furthermore, Media Items and Item Takes can be colored individually when clicking a target color while holding down associated key modifiers (see Help text in the Adjuster).

Learn more about coloring in CSIX
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An advantage of using the associated Theme Adjuster script is to have useful coloring tools available along with other relevant theme settings, as well as making use of dedicated palettes, created with the CSIX Series in mind.

When using the Adjuster, the full project can be recolored at once, regardless of whether the contained tracks are selected first, and including any hidden or locked tracks. Since the function changes assigned colors on ALL tracks in the ENTIRE project, the Theme Adjuster now prompts a warning. Color changes are written to the Undo History so it can be undone, however, there may be cases where there are hidden or locked tracks/items that you are not immediately aware of, so this is mostly meant as a reminder before proceeding.

All theme variants in AE and BC Series have custom overlays on all track panels and automatically inherits a muted color from the parent track to the underlying envelope control panel (EnvCP). From the Adjuster > Globals tab, the opacity of custom overlays is set in the same place for all panel types at once.

Note that some built-in functions requires SWS/S&M extensions to be installed, similar to other linked actions in the CSIX Series. It’s a good idea to install SWS, which over time has become a natural part of the REAPER experience as it integrates seamlessly with a range of useful features. You should also install the ReaPack package manager, which provides access to a number of repositories (including ReaTeam/SWS) with automatic updates, etc.

NEW:
Color Regions & Markers
When selecting individual, multiple, or consecutive regions and markers, the Adjuster allows you to efficiently apply swatches already used elsewhere in the project. This helps maintain consistent color markings and clearly link related tracks, media items, regions, and markers.

Selecting Regions and Markers
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Some useful modifiers for selecting Regions and Markers in Ruler Lanes:

Ctrl/Cmd +click individual regions or markers to add them to the selection.
Shift + click to select consecutive regions or markers (when applicable).
Double‑click lane headers to select all items in that row.

Resetting regions or markers to their default color can be done individually (right‑click item), or via the Region/Marker Manager.

When resetting, the items will revert to the colors set in the Ruler Lane Manager, or otherwise use the default theme colors.

Apply Gradients
The built-in Adjuster tool Gradient to Children has been upgraded with new behavior and now uses the HSL color model for more natural-looking gradients. A new option creates gradients that shift toward the complementary color, giving each track a clearer, more defined separation.

If a sub-folder has a custom color, that color will now be preserved, and the gradient only applies within that folder’s depth. This makes it really easy to visually separate the contents of different sub-folders with just a few clicks.

Mouse Modifiers:
Clicking the icon while holding SHIFT will produce brighter tones. Holding CTRL (CMD on Mac) in addition will slow down the transitions, extending the color range. Holding ALT applies the same tint without stepped gradient, and finally, CTRL+ALT+SHIFT will create a gradient to the complementary color.

Tip:
Further differentiate tracks by selecting the alternate layout TCP Volume-Thumb_ALT. In AE Series the volume label appears yellow with this.

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DM/MC/BC Series
In the margin beneath the track’s Mute and Solo buttons – which are always aligned horizontally in CSIX – selected actions are now available for use with Fixed Item Lanes.

When choosing Fixed Lanes mode, the small list of actions automatically unfolds from top of the panel, allowing to increase number of lanes and track height while leaving the buttons in the same place. Visibility of the list can be changed from the Theme Adjuster > Track Panel.

With the AE Series, actions in TCP are displayed differently, unlocking a wider array of options for various tasks. When in Fixed Lanes mode and tracks are selected, the actions list automatically extends beyond the default buttons, also adjustable via the Theme Adjuster.

AE Light-Inverted appearance
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Tip:
For a very bright look with the Light-Inverted theme, click Reset/Read Color Controls to automatically apply the suggested brightness adjustment:

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Title-Track
The alternate Title-Track layout in AE and BC Series, designed for showing custom colored separators or folders with large text, now has more control options. Dimmed elements light up if there are routing, input or inserts which may affect the overall output, and more track settings can be accessed.

Note that the Title-Track isn’t a ‘blind track’ like the available Visual Spacers in REAPER. A Title-Track is indexed and has same properties as regular tracks, but for the purpose of this layout, it does not show recording controls, automation mode or any parameter settings.

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Supplemental themes in AE Series
There are two more themes in the AE Series package: Dark-8 and Slate-8.
Only difference is that these variants have additional mixer layouts with different colored volume thumbs, for a total of eight distinct colors, plus the default thumb (white).

In addition to custom colors on tracks, the thumbs can be used to highlight instruments types, sections or special track properties. All layouts are preserved when switching between the two variants.