Workaround is to draw velocity automation with a mouse in the main screen. draw exactly the same punch in/out points with a mouse (it looks like inverted track mute automation)when decreasing the volume put it to 1 or 2 because when i put 0 the sample wouldnt start playing till the next midi event is triggered. you may notice that "newly muted" tracks can still be heard although at very low level and its kind of cool for some purposes. in any case its better than a beat that doesnt work