PJ here, Soundslice UI designer. Thanks for the feedback! I really like the idea of displaying the current chord somewhere, and in fact, we talked about doing something along these lines. That's something I'd like to include in the future.
As for the rapid scrolling, I usually zoom out on the timeline which causes the playhead to move slower.
PJ here, Soundslice designer. I'm pretty sure your issue is that to add a note, you have to hover over the particular string you want to add the note to while you have a selection. You can also press 'A' to add a note to the next available string. Does that help?
As for the rapid scrolling, I usually zoom out on the timeline which causes the playhead to move slower.