Software in general tries to be backward compatible with the older versions, but once you do anything to change the file structure (to accommodate new features), it becomes very difficult to use content files created by the new version in an older version. Some software packages do provide a "save as previous version" feature; however, from what I've seen, most are looking forward, not back at older versions.

At least for now, (without trying it) my understanding is that most of the older versions will load a newly created SGU file, but you're still going to get errors (since the older version won't have all the content.

If some of our wishlist items do get implemented in the future, then I see the file format radically changing where it may not even work in the most recent version (for example, 8th note chord resolution, true time signature support, automatic (optional) transposition when you make a key signature change, perhaps separated and multiple additional tracks support). Since most of what is read in is math, it would be easy to load in an old file and make it fit the new format; however, going the other way would be a lot of work that they probably would rather spend time with new capabilities.

My $0.02 worth.


John

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