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Old 03-04-2019, 03:47 PM   #5
schwa
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Join Date: Mar 2007
Location: NY
Posts: 15,750
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Melodyne's undo state can be very large (100 MB or more).

With "minimal undo states" disabled, the Melodyne undo state is saved along with the REAPER undo state, so that everything stays in sync. But if the Melodyne state is very large, like with a lot of analyzed media and edits, this causes a noticeable slowdown after every edit as Melodyne transmits its state data to REAPER.

With "minimal undo states" enabled, the Melodyne undo state is not saved along with the project. You can still undo Melodyne edits by using the undo action built into the plugin, but if you undo a REAPER edit that makes the project and the plugin out of sync, Melodyne doesn't know what to do and resets the analysis.

Unfortunately, you need to choose one or the other. Celemony has been talking about some improvements to their undo system that would help, but I don't know how far along they are.

For now, all I can say is, save your project often!
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