Bake sound to F Curve giving square curves? Just working my way through this tutorial . . . Got to about 5.55 in the video and hit a snag.

My soundfile loads into the graph editor, but instead of appearing as a series of curves, it shows up as collection of squared-off straight lines. 



Here are the import settings:



. . . and .blend file.

Anybody know what gives?
The issue was that in setting up the custom property 'Sound'. In the video, the tutor enters '0.0' into the Property Value. I didn't notice the decimal and entered '0', thus switching the property to 'integer' instead of the desired 'float'.

I removed the keyframes from the Sound property, edited the Property Value to '0.0', added a keyframe and reimported the sound (bake sound to fcurve).