Combo Mirror Ovum

Pick a sampler once and have every sampler dropdown in the workflow follow along. That's the pitch, and it's a good one - anyone who has manually synchronized five model or scheduler dropdowns across a big graph knows the pain. Combo Mirror adopts the option list from any combobox input you connect it to, lets you pick a value once, and feeds that same selection into as many compatible combo inputs as you want.

The mechanism is a frontend/backend split, which is typical of this pack. The frontend reads the options from whatever combo input you've connected, mirrors them into the node's own value widget, and the backend simply reports the currently-selected string at execution time. There's also a hidden combo_options_str field that carries the raw options for inspection.

The inputs that matter

• value (COMBO) - the mirrored options; this is what you actually pick from. Connect the node's output to the combo input you want to mirror, and the options appear here.
• choice_index (INT, default -1) - force a selection by numeric index. If it's not -1, it overrides everything else and manual picking is disabled.
• choice_regex (STRING) - auto-pick by pattern. The matching order is: regex search, then exact (case-sensitive), then exact (case-insensitive), then substring contains.

Outputs:

• combo (COMBO) - the selected value, wired into your target combo inputs.
• strings (LIST) - all the mirrored option strings, for debugging or fan-out.

How to use it

Place it near a node with a combobox (model, scheduler, sampler). Connect ComboMirror's output to that input, and the options mirror into the widget. Pick once, then wire the combo output into every other compatible combo input you want to stay in sync. For automation, drive it with choice_index or choice_regex instead of a human.

When it's genuinely useful

The textbook case is a workflow with multiple samplers that must run the same scheduler or the same sampler name - switching models in a multi-pass graph, syncing the VAE/scheduler selections across an ensemble. If you find yourself editing the same dropdown in three places for every change, this earns its slot.

The honest counterpoint: if your dropdowns live on one node or you change them rarely, a mirrored selector is added ceremony. It shines specifically when "keep N combos consistent" is a recurring chore.

Installing it

Part of comfy-ovum:

cd ComfyUI/custom_nodes
git clone https://github.com/sfinktah/comfy-ovum

Restart, or ComfyUI Manager → search "comfy-ovum". No models, no extra deps - but note the mirroring lives in the frontend, so the pack's JS must load (it does, by default).

Gotchas

The combo_options_str field is marked "internal use only" - leave it alone. The regex matching order matters if your options overlap ("euler" vs "euler_ancestral"): it tries regex first, so a sloppy pattern can grab the wrong option. And since mirroring happens at UI time, options that update dynamically during a run can lag a step behind what you see.