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You may discover that the Smart Lines for 8vb and 15mb incorrectly produce 8va and 15ma below the staff in JetStream, rather than the expected 8vb and 15mb.

This is actually working correctly in JetStream, but somewhere along the way, MakeMusic changed the symbols for Octave Down (8vb) and Two Octaves Down (15mb) to ALSO be 8va and 15ma, which is incorrect.

The solution is to navigate to Smart Shape > Smart Shape Options… Select Octave down from the popup menu, which is now incorrectly labeled “Octave Down (8va)”, then press the Select button, and choose the correct 8vb symbol from the Symbol Selection dialog. Then do the same thing for two octaves down, choosing “15mb”.

Now, the corresponding Smart Line buttons in JetStream will produce the expected results.