Just to be clear import or open the functionality is poor. Bar number issue aside it is sketchy as how one aligns the bars.
Indeed... I was just wrestling with getting it to work for a recent song. I had issues with the tempo of the import being changed drastically. The ACW should be re-coded so that it will import the audio and not change the tempo. It should also have a much easier way to set the first bar and beat of the song. The current window is absolutely confusing.
I've tried to use it simply by dragging the audio in, and hoping it lines up....and then just going measure by measure typing in the chords manually as that was actually easier, faster, and more accurate than trying to get the ACW to do it's job like one would expect it to do.