I fixed the circling camera, by saving the .blend file to a different filename.
I tried the same approach for FuncChk01, naming it to FuncChk02, and the sound emitter worked, but the animation of the pistons moving wasn't going.
So I went back, and "Save as" and saved it back to FuncChk01, and the piston animation worked, but the sound emitter didn't, weird.
Can someone please tell me whats going on?
Should I try just re-installing Blender?
Better to have loved and lost than never to have loved at all