#1. SD1 w 4.0 & SD1plus have a feature called "unplugged". Call up the sounds being used within a style, select a part, press 2 master volumne control buttons and that part is isolated. I mostly use it to isolate guitar parts. When you press a fill in or break, all parts come back on ....

#2. The "to end" button is extremely helpful. SD1 has 3 endings, but the "to end" feature will end any style with a 1 measure ending.
I wish we could "to end" midi files that are too long, without having to edit in software...