Solution:
As a virtual MIDI port, EZplayer is subject to the same limitations as an external keyboard. Latency and MIDI ‘jittering’, which in combination will be perceived as faults in timing on playback, is typical of large buffer sizes in the host.
We recommend programming your tracks exactly as you would if you were to record an external source, at a low buffer size. Once you are finished with programming you can either render the drum track to Audio or drag the track(s) made in the Arranger right into your project, and bypass EZplayer so the source is no longer being ‘driven’ by it, leaving your MIDI track to do the work.