its the same problem like in meteor, the velocity bars in the midi editor are way to small or thin for my fingers to get them. please have a look at nanostudio.
jan
Hi Jan
Try out the “Draw” mode.
When Draw is switched on, all you need to do is simply swipe across the velocity bars, no precision “aim” required. 
Ok. But with draw mode on. I change all velocity bars when more notes are layered on the same time mark.