This reverts commit edcb6314f2b1b06e70dbb214674eb7c2325f8ab1. The fold was a mitigation: the doubling was never in the assets but came from the decoder dropping straddled-header frames, letting the premix streams drift and comb. With the decode fixed at the root, the full summing fold is clean and cutscenes regain centre and rear content.
AC6's cutscene mixer submits its 5.1 premix to all six speaker slots as decorrelated near-copies of one mix; six real speakers separate them acoustically, but the port's 6→2 fold sums them, combing speech into the long-reported doubled dialogue. While the demo sequencer ticks, fold only the fronts (verified lossless). audio_cutscene_downmix (default on).
A render hitch during an in-engine cutscene permanently desynced video from the audio, which is master and keeps playing. Weak-symbol wrappers around the two demo-manager Exec functions issue bounded catch-up ticks computed from the audio clients' consumed-sample clock (48 kHz, deficit threshold 2). Behind ac6_cutscene_resync (on); dev tooling default-off.
Dipshet