If you set the grouping to a number, the channels will be divided into that many groups of channels, where each group runs the effect together. So if you had channel 1 > 6 running an effect, spread would cause all 6 to have different levels at any given time, but a grouping of 3 would cause 1 and 4, 2 and 5, 3 and 6 to have an identical value for each pair of channels. Here "identical value" means "starting at the same place in the effect".
Is this what you were asking?
You may have instead needed the "trail" key which is the distance between each channel in the effect. So if you have 6 channels and you want them to be at almost the same place in the effect, but not exactly, use a trail of 5%, which would start each channel 5% of the way through the effect. A trail of even makes the channels spread out evenly through the effect which is equivalent to a trail of about 17% for 6 channels (100% divided by 6).
Good idea. We will be adding it to encoder controls in an upcoming release.
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