Finale v.26, on a Windows 8.1 computer.  How do I get a rit./rall. to actually slow down (or an accel. to speed up) during playback?  I've tried the instructions under "Tempo" in the user manual which are convoluted; it involved using Shape Design and a grid pattern.  All I ended up with was a never-ending fermata on playback.  Isn't there a simpler way which actually works?