Testing markdown

Just installed extended php-markdown plugin and this post is written in markdown as a test.

Here’s some emphasisstrong emphasis and code.

• A bulleted list

• another item

• A numbered list

• another item

The code:

Just installed extended [php-markdown](http://michelf.com/projects/php-markdown/)  

plugin and this post is written in markdown as a test.

Here's some *emphasis* **strong emphasis** and `code`.

* A bulleted list
* another item

1. A numbered list  
2. another item  

I’ve turned off the visual editor but WordPress still shows the simple HTML icons. is there anyway to change these so that they insert markdown rather than HTML?