Welcome to the forum N3r0! Here are all our important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
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I think you may mistake the note-block
for a Beat&baseline block.
Only Beat&baseline blocks can be extended in song-editor.
More here:
https://lmms.io/wiki/index.php?title=So ... h_Segments