This may help others frustrated by the annoyance of a stuck note in the middle of a recording project: currently my project uses about 25,000 midi events, and stuck notes are a frequent problem. But I noticed that there is a habit of starting from channel one and working up, so that channels 1-4 are very heavily loaded and channels 11-16 are very lightly loaded. When I shifted a bunch of data out of the first channels and into the upper channels, most of the stuck note problems went away. No change in data, just moving it to another more free channel. Perhaps gigastudio works in 'threads' per channel?
[Edit] as I listen to my stuck notes ... it doesn't cure all of them.......[/edit]