Mpi H3 References

MiniMax H3 reference conditioning with every slot exposed at once: 9 images, 3 videos with paired soundtracks, 3 standalone audio. Empty slots are dropped and the rest renumbered, so ONE graph covers every combination instead of a branch per combination. An empty slot means either nothing connected or an Mpi loader with block_if_empty OFF (a 1x1 image / 1-sample waveform) - real black images and real silence are not mistaken for empty. The conditioning is built by core's own MiniMaxH3ReferenceToVideo. Write the prompt against the SLOT numbers - <Picture 1> means ref_image_1 - and the node rewrites them to the ordinals core presents, dropping any tag whose slot is empty. That is what keeps a tag pointing at the same input when a slot ahead of it is left empty, and it is the only way to be right about audio: a reference video's soundtrack consumes an <Audio j>, and whether the file HAS one is unknown until it is decoded. `ref_tags` reports the resulting map.