Interesting that each of our experiences with juke box have been different. I've actually had pretty good repeatability with "r" and "p" as stop and start... but only if I set the stage by clicking the NEXT button right off the bat (thereby skipping my first song)

After that I can stop, start or skip ahead to the next song without incident, as long as I only do those 3 things. If Use any of the buttons, it changes everything and my keyboard shortcuts don't work anymore.

I am NOT using the conductor... only Juke Box.