Enable SHOW LANES on a track
Place cursor in a lane
Press CTRL key
The PLAY tool is enabled, with the Play cursor icon showing
Press & hold CTRL key, and Left click & hold on an event–audio will play
However, if you click & hold on the event first, and then press CRTL, you can move the event up and down in the lanes with the time position locked–which is the correct function of CTRL+ left click & drag
The same behavior occurs in the Audio Parts Editor.
I did post about this a little while ago when I was first trying to get the time-locked event moving function to work in 6.5, before I had isolated the behavior.