I wish for a better instrument replacing mechanic where unlike in V3 you only can replace instruments, change panning etc. on just one sheet at a time which can be time consuming, make it to where it will let you change that particular instrument you are replacing globally throughout the song especially in one or multiple layers. In other words, being able to replace all of the same particular selected instruments throughout the song and not just one sheet at a time like you can only do in V3, for convenience sake