LTXV LoRA Block Edit

The LTXV LoRA Block Edit is the pack's deep-cut node - the one with zero search impressions that nobody stumbles on by accident. It's a panel of 28 switches, one per transformer block of the LTX Video 0.9.x model, and its entire job is to decide which of those blocks a LoRA is allowed to influence. Every switch defaults to on, which means no restriction at all: leave it alone and it's a harmless no-op.

The idea comes from the Hunyuan Video scene, where kijai's wrapper popularized block-selective LoRAs as a debugging tool - the README credits it directly. The mechanism is about as simple as a node gets: the node collects every toggle you've turned off into a SELECTEDBLOCKS object, you feed that into the LTXV LoRA Selector's blocks input, and the selection rides along with the LoRA descriptor so the apply step knows which transformer blocks to leave alone.

When you'd actually use this

Honestly? Rarely. It exists for surgical work. If you've got a LoRA that nails a character's face but wrecks motion, or a style LoRA bleeding into the wrong features, block selection lets you keep the good parts and amputate the bad. In practice you flip a few blocks off, re-run at LTX's delightful speed, and see whether the artifact moved. If you're not actively diagnosing a LoRA artifact, every toggle stays on and this node earns its keep as a pass-through.

The inputs

• blocks.0. through blocks.27. (BOOLEAN, all default true) - 28 toggles. On means the LoRA applies at that block; off means it skips it.
• output: blocks (SELECTEDBLOCKS) - wire this into the LTXV LoRA Selector's optional blocks input.

The 28-block count matches the 0.9.x-era LTX Video models, the 2B in particular. The 13B, and certainly LTX-2/2.3, have different block counts, so don't expect this panel to map cleanly onto anything newer - another reason this whole pack is a 2025-era tool.

Installing it

Same story as the rest of the pack:

cd ComfyUI/custom_nodes
git clone https://github.com/dorpxam/ComfyUI-LTXVideoLoRA

or ComfyUI Manager, search ComfyUI-LTXVideoLoRA, restart. Then remember it needs both friends: Block Edit → Selector → Loader. A block selection with no selector to receive it does nothing.

The trap

The trap is expecting this node to do anything on its own. It's a config object, not a processor - every toggle defaults to true, and unless it's wired through a Selector that's feeding a Loader, it changes exactly nothing. If you toggle blocks off and see no difference, check the chain first; then check that the LoRA actually targets the blocks you disabled. When a LoRA's effect is spread across all of them, block editing is more scalpel-adjacent than scalpel.