It would be very useful to have the possibility to import an audio into the score and write the parts with the audio track, to be able to playback alongside the instruments you wrote. I write arrangements for orchestra to accompany artists and being able to import their original songs to listen and check the parts I`m writing side by side would be a major improvement. StaffPad has a similar feature. Also, it would be useful if this feature came with intelligent BPM check, in which Notion recognizes the BPM of the audio and transcribes to the score.