Segment improvement

Playhead is being covered by the segment colour. Kinda hard to seek if it is so :)

p.s making alpha <1 does not help

![63c8d92f2ad19a927ee68f03c2f259a5](https://f.cloud.github.com/assets/3653259/2184872/5d4fad50-97c9-11e3-9982-5b3fac173e18.png)