This strikes me as being very slow, tedious and kludgy. I think it would be much better to have a larger width in the audio track and the have the ability to place fade points in the track where one will be using them. Also, waveform in preview window should be in a contrasting color from the line indicating volume. Or possibly when one double clicks the audio track have the audio track come up in the preview window with the cursor in that exact spot and be able to place a fade point without the cursor moving. Customarily in every audio and video program I've ever used the space bar is the stop and start in the particular window that one is using. If I hit the space bar when I'm in the Preview window it automatically starts playback on the time line and that in and of itself is quite confusing.