I've got a few questions about stereo separation beacuse I don't think I fully understand this, even though I've been trying to find some information online and tested it myself also.

  1. Can somebody please explain how does it exactly work?

  2. How is it possible that when I load basic kick that comes with FL Studio (the one that is automatically loaded in new project in channel rack) and then turn "stereo separation" knob in mixer right (mono) the sound differs even though it's a mono sample? It sounds different also when I turn it left. How is that possible?

  3. Why does "stereo separation" in fruity stereo enhancer sounds different than the one in mixer? I tested it on the kick sample.

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    Have you read the manual? Do you know where the manual can be found? What part of it do you not understand? Do you expect someone to copy-paste text from the manual into an answer here? To me the manual looks pretty clear on this, and it would be a disservice to your learning and music-making to copy that text here, so you wouldn't have to learn to search for things. Mar 6 '19 at 17:27
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    @piiperi The manual does seem clear, but it also states that it has no stereo effect on mono sounds . So perhaps at least point 2 is not dealt with fully by the manual..?
    – topo morto
    Mar 6 '19 at 18:10
  • Are you using the stereo enhancer plugin? Is that what you’re asking about? Are you sure the kick sample is mono? Do you have any reverb turned on? Mar 6 '19 at 19:35
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    I've found the option to see if the sample is in mono/stereo and it appeared that a kick sample is stereo and differs a bit. That's strange. The other sample in mono sounds just as I would expect it to sound (no changes in stereo separation). And I'm using FL studios mixer stereo enchancing. I still don't know why these 2 ways of stereo enhancing sound different but I suppose it's because of different approach to enhancing. I've dig into the manual again and found answer to 1 question, too.
    – Raven322
    Mar 6 '19 at 20:16

According to the manual, the "stereo separation" filter (control) only increases or decreases existing stereo separation, so if you find that the knob increases stereo width, then the filter's input was not completely mono. Such stereo width corresponds to the "s" aka "side" component in m/s (mid/side) encoded audio.

The Fruity Stereo Enhancer effect's capability to produce stereo separation from a completely mono signal does not come from the stereo separation filter, it comes from the "phase offset" effect, which delays either the left or right channel.

It's worth keeping in mind that a simple left/right delay can produce a stereo field that's not "mono compatible". Mono compatibility means that if your stereo mix is listened to in mono so that the left and right channels are summed, it will still sound good, and no frequencies disappear completely because of canceling. Summing a signal with a delayed version of itself produces comb filtering, which attenuates parts of the spectrum, depending on the length of the delay. There are mono compatible pseudo-stereo/stereoizing enhancement methods which do not use left/right delaying but comb-shaped EQ curves that go together nicely when summed to mono.

  • Thank you for your time, piiperi. The weird thing is, that I set time offset to 0.0s so it should not affect this mono sound in any way, but somehow it does. When I use stereo separation in mixer channel, nothing changes (and it's understandable because it's a mono sound). Maybe it's because of different technique of stereo widening used in stereo enhancer?
    – Raven322
    Mar 6 '19 at 21:22

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