Sequencer audio strip

Sequence Editor:
Why does the waveform reference on the audio strips not match up to the actual audio accurately? For example when I scrub the audio the sound starts a few frames before the waveform reference inside the audio strip starts.

How can I get a waveform reference to sync with the audio in Blender? This will be real helpful when lipsyncing. You would be able to scrub the audio and look at the wave file at the same time. This will allow you to lipsync faster and more accurately.