Hi, look to me Sonar is a shell program, well depending on your skill set and what you use in your DAW almost all are. And by shell program, I mean the DAW is used for editing and mixing - I stick with Sonar mind you because it is a Windows specialist, and because it's 64bit mix engine with up-sampling is still by far the best in business IMO.
These days, because of my skill set...I use Notion 6 by Presonus for most of my sequencing, I then import either audio files or midi files into Sonar for mixing. Midi sequencing - whether you're using Sonar, Logic or some other program - using the old block system is a pretty poor cousin to music notation, and particularly when you can write in dynamic changes and the like so much easier in a program like Notion.
So if you want to use notation to sequence, then I would use a separate program such as Notion.
I think it's time Cakewalk put this bugbear to bed and just drop the 'notation' screen in Sonar. It does not work, and it is useless. Sorry Cake. But someone had to say it.
Ben