I would like to change a piece written in 4/4 meter mostly of 16th notes, 8th notes, tuplets, and dotted 8th notes, into the same piece with all the note durations having double the previous value. After trying the various Write/Edit durations options, I have not been successful. Is there a way?
Selecting everything, making sure Insert mode is active by pressing I, then choosing Write > Edit Duration > Double Note Duration should work on all the notes. Then it’s a case of replacing the 4/4 time signature with a 4/2 one (if desired).
If you have many tuplets that might be a problem.
See for example: