Looks like there's already a thread going about MM: viewtopic.php?f=4&t=7523087
That's great you bought AutoLatch. Are you having fun with it?
So the way players work is from the top down. MIDI notes played live or sent from Reason's sequencer are sent from the top of the player stack and they work their way down to the instrument. So any notes coming from the sequencer (or live keyboard) will pass thru AutoLatch, thus their gate length will be affected by AutoLatch, as will any additional players placed above AutoLatch.
If you want to skip some notes over AutoLatch, you can do that with the use of MIDI CV Converter. and Le Note's Note Receive (free player).
Here's a Combi I just threw together that will show you a few things....