The problem is that professional NLEs have been using this feature for a long time, but Cinelerra has not. All detours to simulate multiple timelines are only detours and no real solutions. "Nested Clips" and "Edit EDL" are not multiple timelines. Nested Clips and Edit EDL functions can be used to program the desired timeline feature. OpenTimeline could be used as a basis for this. We want to be an alternative to the commercial NLEs (Windows replacement), but Cinelerra would need to be able to handle a relatively simple feature like timelines. Users of the commercial NLEs know this feature very well and all previous methods on Cinelerra are not multiple timelines. For this reason, I work almost exclusively with DV Resolve, because I have this feature there. However, I'm not a friend of non-open source software, but unfortunately I have no choice but to work with it. The timeline feature is not a big magic work, the basics were already done by GG with the new EDL features. The EDL & Nested Clips feature would only need to be extended by a few additional functions. Sam