1) New project. 2) Generate a tone. 3) Use envelope tool to add just one control point 4) and pull it down somewhat. 5) Go back to Select tool. 6) Double click the track. 7) Copy. 8) New track. 9) Generate another tone. 10) Pick any point in it. 11) Paste. 12) Observe: The track's entire envelope is adjusted down. This is incorrect. If instead you make even one control point beforehand in the destination track, results are different (and according to code comments, as intended). A nearly discontinuous change of envelope level then happens before and after the pasted part.