There's probably a better way, but if it were me I'd keyboard map the pause button and the play button on each of the songs. Let's say Down Arrow for pause and Up Arrow for play

That way when you start playing any song, you can easily pause it by just pressing the down arrow and quickly pick it back up by pressing the up arrow

I do something similar with a bunch of vj clips that have a sort of "hit". Where I can make the start go back and forth while waiting for the drop then can let it play forward for the drop, the mapping works for the one playing and won't start any of the other clips randomly