Designing the Sound
- →Explain why single-pass joint generation produces sync that a post-dubbing workflow has to work for
- →Write a prompt that briefs the audio stream as deliberately as the picture
- →Choose between audio-to-video, Foley V2A, Text-to-Audio and LipDub for a given shot, and price the choice
- →Set honest client expectations around a Beta feature and around a 24kHz deliverable
LTX-2.3 generates picture and sound in a single joint diffusion process. Not picture, then sound. Both, together, in the same pass. The two streams talk to each other throughout the network, and — this is the part with craft consequences — they receive different context embeddings from the same prompt. The same words condition two different things.
Here is why post-dubbing loses. In a post workflow you generate motion, then find or make a sound, then align it. Alignment is the whole job, and it is never quite free: the door closes on frame 41, your effect starts on frame 41, and something still sits a hair off, because that sound was not made by that door. Joint generation removes the step. The impact and the sound of the impact come out of the same process. You are not aligning; it arrives aligned.
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