EmAySee Dynamic Range Slider

A lot of ComfyUI automation boils down to "take a value between 0 and 1 and turn it into a real number." That's exactly what this node does. Give it a percentage (value_percent) and a target range, and it outputs a float inside that range, snapped to a step you choose. If you're driving CFG strength, denoise, or an aspect-ratio knob from something that outputs normalized values - a randomizer, a batch counter, an animation LFO - this is the adapter that makes the two talk.

How it works

The math is: min_val + (value_percent * (max_val - min_val)), then round to the nearest step_val, then clamp between min and max. Three details make it less naive than it looks:

• It auto-swaps reversed ranges. If min_val > max_val, it flips them before computing. Sloppy-friendly.
• It quantizes. With step_val of 0.25, a value_percent of 0.37 doesn't give you a float with nine decimals - it snaps to the nearest step. That keeps downstream widgets and prompt text tidy.
• It clamps. Output is guaranteed inside [min_val, max_val], so a value_percent of 1.0 can't overshoot.

Inputs and outputs

• min_val (FLOAT, default -1) and max_val (FLOAT, default 2) - the range.
• step_val (FLOAT, default 0.25, min 0.001) - the quantization step.
• value_percent (FLOAT, default 0.5, 0–1) - the normalized position in the range.

Output: value, a FLOAT. Wire it into anything that takes a float - a KSampler's cfg, an Empty Latent's size via a multiplier, a denoise value, or a conditional comparison.

Where it earns its place

The killer use is animation and batch control: instead of hand-typing 30 different CFG values, feed value_percent from a counter or an eased curve and let this node map it across a range. It's also the natural partner for the pack's EmAySee_DynamicStringSelectorNode and EmAySee_GreaterThanNode when you're building conditional branches that depend on where a value currently sits.

Install

Part of the ComfyUI_EmAySee_CustomNodes pack. ComfyUI Manager → search "EmAySee" → install, restart. Or:

cd ComfyUI/custom_nodes
git clone https://github.com/EmAySee/ComfyUI_EmAySee_CustomNodes

No dependencies beyond ComfyUI's bundled math (it's in the standard library), no model files. Restart, and you'll see the pack's "SPECTRE v5.0" banner in the console.

The honest take

It's a small node, but it's the kind of small node you end up using in every animation workflow once you know it exists. The default range (-1 to 2) is odd - clearly tuned for something like a strength/CFG sweep - so set your own min and max and don't trust the defaults. And note value_percent maxes at 1.0, so you can't exceed the range with it; that's a feature for automation, a mild annoyance when you're trying to nudge past the edge by hand.