Muse Collective LTX Timeline V1

The problem with LTX 2.3 is the exact opposite of the problem with Wan: it's fast enough that you want ninety seconds of it, and then you discover the hard way that a single generation only goes so long. MuseDirectorSamplerV1 is Muse Collective's answer - a full "director" node that wraps LTX 2.3's entire pipeline - timeline, chunking, per-segment prompts, lipsync, and layered audio - into one widget with a built-in visual editor. It's the node everything else in this pack forks from.

The lineage matters here. This is a from-scratch, standalone reimplementation of the LTX Director approach that WhatDreamsCost made famous (that node's 2.0 release was one of the bigger r/StableDiffusion hits of mid-2026). Muse's version drops the WhatDreamsCost dependency entirely. Same idea, own code, MIT-licensed.

How it works

Think of it as a mini non-linear editor feeding a chunked sampler. You get a visual timeline with four tracks: MAIN (image/video segments that act as reference frames), AUDIO (speech or music for custom audio), BG AUDIO (background ambience mixed under everything), and MOTION (reference video segments for IC-LoRA motion guidance). You drag assets in, set a global prompt plus per-segment prompts, and the node handles the rest.

Under the hood it's the same reference-frame latent extension as the V7 sampler: each chunk carries the last carry_frames frames (73 ≈ 3s at 24fps) of the previous chunk into the next as locked reference, generates the new region in a single pass, then runs the two-stage LTX flow - Stage 1 drafts at half resolution, the spatial upscaler refines. Per-segment prompts use LTX's temporal attention masking (PromptRelay), and there's automatic color matching between chunks.

Prompts use the pack's uppercase tag convention:

A woman sits at a podcast desk, talking confidently to camera.
[SPEECH] Right, I'm going to tell you something most people in this space won't admit.
[SOUNDS] Quiet studio, soft air conditioning hum, distant city traffic

[SPEECH] drives lipsync, [SOUNDS] drives generated ambient audio. The tags must be uppercase - lowercase gets ignored.

Inputs that matter

The widget list is enormous, but here's the short version:

• Audio toggles - generate_audio (ambience from [SOUNDS]), custom_audio_on (play a file from the AUDIO track), lipsync (requires Custom Audio ON and the talking-head LoRA on the model input).
• base_model (optional) - wire a LoRA-free UNETLoader output here so the ambient pass generates sound instead of speech-influenced mush.
• chunk_duration_seconds (10), carry_frames (73), carry_strength (1.0) - chunking and continuity.
• stage1_steps / stage2_steps / stage2_denoise - 8 / 4 / 0.42 is the recommended baseline. cfg stays at 1 (distilled flow-matching; CFG 7 is an SDXL habit to unlearn).

Outputs: last_chunk_frames, audio, and stage1_frames (the pre-upscale draft for debugging).

Installing it

cd ComfyUI/custom_nodes
git clone https://github.com/muse-collective-26/muse-ltx-timeline

Restart, then install the pack's Python deps and VideoHelperSuite:

pip install av torchaudio soundfile

This is an LTX 2.3 node, so it wants the whole 2.3 stack: the 22B distilled transformer (mxfp8 block32), audio + video VAEs, the Gemma 3 12B fp4 text encoder, the spatial upscaler in models/latent_upscale_models/, and - if you want lipsync - the talking-head LoRA in models/loras/LTX2.3/. That's a lot of downloads, and none of it is optional.

Gotchas

• It's a big node on big hardware. 22B transformer plus Gemma 3 means you want serious VRAM and 64GB of system RAM realistically. Community reports put 2.3 at ~8-16GB workable with quants, but don't expect a 12GB card to fly.
• The timeline is managed by the node's JS - if the timeline UI doesn't show, check the browser console; it's a known class of issue with these director nodes.
• V1 has no Seed Hunt. If you want the seed-scouting workflow, that's V2 in the same pack.

The verdict: if you're serious about LTX long-form - talking-head content, podcasts, music videos - this family of nodes is the most capable route that doesn't involve wiring a hundred nodes by hand. Start with V1, and know that V2's Seed Hunt is the one upgrade most people actually use.