For Windows, "Piano From Above" works very well. For an Android tablet or phone, "Midi Voyager" is a good program. These are the only two programs I am aware of that give you a nice vertical-scrolling piano roll view. https://officialblackmidi.fandom.com/wiki/Piano_From_Above https://officialblackmidi.fandom.com/wiki/MIDI_Voyager Phil Dayson