Double tapping a chord on the composition train will copy and paste it to the end of it. However the train will not scroll making it easy to copy several chords in a row.
This also allows to repeat the same chord by double tapping the last one on the composition train.
Holding a chord on the composition train and tapping one of the transposition buttons will transpose that chord and all the chords to the right of it. If you only want to transpose an individual chord, transpose it and transpose the chords to the right of it back to where you want them.
Of course, if you just tap the transpose buttons, everything will be transposed.
The new features for sharing and exporting are explained here
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