XController

ComfyUI ships a Primitive node for feeding numbers into a graph, but "feed a number" and "have a physical knob to turn" are different feelings. XController is the pack's answer to the second one: one node that renders as a Knob, a horizontal or vertical fader, a Toggle switch, a hold Button, or an XY Pad - your pick via a dropdown. You get real, saved control widgets that drive anything with a numeric input, which is a much nicer way to scrub a denoise strength or CFG than typing into a box.

How it works

Pick control_type and the node re-renders itself as that widget. All the configuration is done through hidden, socketless widgets that the frontend draws for you, so the node looks like a control surface rather than a wall of sliders. The outputs are what you wire downstream:

• FLOAT - the current value of any analog control.
• INT - the FLOAT truncated toward zero, for the integer-input nodes.
• BOOLEAN - current state, for Toggle and Button.
• X and Y - the two coordinates, for the XY Pad.

value_mode decides how a 0–1 widget position becomes a FLOAT output:

• Range - mapped between min and max, with step snapping (set step to 0 to disable snap).
• Steps - snapped to the nearest entry in a JSON array, default [0.0, 0.25, 0.5, 0.75, 1.0].
• Percentage - a base value with a percentage offset range, e.g. base_value 100 with ±50%.

The Button is the fiddly one: button_mode picks Increase, Decrease or Toggle behavior, it moves one step per repeat, and it reports "is it being held" on BOOLEAN. The Toggle flips BOOLEAN and emits 0 or 1 on FLOAT. XY Pad gets its own x_min/x_max/x_step and y_* twins, plus crosshair_visible and grid_visible for aiming.

Everything has a sensible default and a reset/start value, so a workflow loads into the position it was saved at. The node is marked not idempotent - its output is genuinely "whatever the control currently says," not a cached value.

Installing it

XController ships in ComfyUI-Xz3r0-Nodes (by Xz3r0-M), found under ♾️ Xz3r0/Workflow-Processing. ComfyUI Manager: search ComfyUI-Xz3r0-Nodes and install. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/Xz3r0-M/ComfyUI-Xz3r0-Nodes.git
cd ComfyUI-Xz3r0-Nodes
pip install -r requirements.txt

Restart ComfyUI after. No model files, no GPU cost - this one is pure UI. It does depend on the pack's frontend JS, so if you're on an ancient ComfyUI the custom widget may not render; update ComfyUI before filing a bug.

Gotchas

The steps field is a literal JSON array - write [0, 0.25, 0.5, 1], not 0,0.25,0.5,1, or the node falls back to [0, 1]. And remember the INT output is truncation toward zero, not rounding, so a FLOAT of 3.9 becomes 3. For most people the honest take is: this is the node you reach for when you want to actually feel a parameter, and a plain Primitive when you don't. Not a workflow-critic, but the one I'd grab for an interactive demo.