The sequence editor currently requires a lot of vertical scrolling to edit the 48 tracks available.

To remedy this I would suggest a toggle switch to a compact 8 track view (kicks, snares...) fitting the screen vertically and which currently displayed instrument could be selected from a long press on the header (instruments with notes already assigned highlighted in the list).

The edition could also be greatly improved by enabling to paint/erase multiple notes from long press. This actually also applies to adjustment of note properties (velocity, pitch...) and the EQ sliders.