The main drum pad on my desk is an mpc one.... Whilst it can do midi and also has some ableton functionality it's not really a pad controller but a full stand alone machine of it's own. If your looking for pads for midi and your an ableton user I would suggest looking into the ableton push which has full deep integration for controlling Ableton. Alternatively on a smaller budget the Novation launch pads are pretty nice and have good functionality with ableton.... for midi triggering I mainly use the pads on my Novation launchkey MK3
I already have a video showing that method as well. I made this video to show a quicker method as note expression can be long when your in studio sessions with artists and trying to get a quick result. As explained in this video....I also have a link to the note expression method video on the end screen 😀