![]() ![]() * This excludes "Movie Mode" in Auromatic, which I understand does do some extraction (as you would want with movies) but I haven't tested it. Continuing down the line we have the volume fader, a stereo separation knob, phase invert, and stereo swap. However keep in mind while most DAWs have the mutes light up when active, FL Studio mutes are when the green light is off think of it light a disarm more than a mute. Some may like that better, some may not and for many it depends on the source material as to which they prefer. Next we have a mute switch represent by the little green light. The Stereo Shaper allows you to pan stereo tracks using either of the methods described above. By doing that but leaving the signals in the L&R untouched, the imaging and soundstage never seems degraded or altered to my ear at all, only "enhanced." *ĭSU, with center spread on treats the center more similarly to Auromatic and is certainly better than extracting (deleting them in the L&R) all the common information from the L&R and dumping it into the center channel as it does with center spread off, but it still quite aggressively extracts decorrelated signals from the L&R and sends them to the surrounds which has more of an effect of wrapping the soundstage around the listener. NOTE: This is the method used by the FL Studio Mixer pan control. It copies the common material between them and places that in the center channel, as well as copying the decorrelated (out of phase) material and sending it to the surrounds. But the only current upmixer that works that way is Auromatic (which may be why it is so widely preferred for music listening). You can probably guess that successful or correct directional decoding is not guarantied and there are a lot that can go wrong with this process. If you simply get the center channel by summing the left and right channels, for example, the hard panned sounds (those sounds present originally in only the left or right channels) will "leak" into the center channel, and will therefore causes the sound images to shift closer to the center and the sound stage to shrink. The ideal goal is to remove it completely from the left channel, and reproduce it by distributing the sound to the center and right channels only, based again on the pan law (possibly a new pan law for 3 front channels). The upmixer will have to intelligently extract the sound from both of the original channels, computes its direction (directional decoding), and redistribute it to the 3 or more channels. Now, if you are adding a center channel, and do not want to upset the location of the sound. (You need to know this pan law if you want to extract the location of the sound, and the pan laws we know of are far from perfect.) The mathematical relationship between the strengths/timings in each channel to perceived position by the listener is the "pan law". It's magnitude in the left channel will be lower than the magnitude of the right channel, or alternatively it can be done through a time delay panning (as in recordings using spaced mics). ![]() In the 2-channel recording, the sound will be in both left and right channels. Say, you have a sound panned half way between center and right. Upmixing from 2-channel to multi-channel is very tricky.
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