Ok, I have done a bit more work on these, using the Site that Jason recommended, this is what i have come up with... not sure which icon I want to go with, the pillars or the mic. But the different levels will have a different colour laurel.
- Voice Recorder - Red
- Audio Editor - Green (proof2)
- Webcaster - Yellow (Gold)(proof1)
- Instructor - Orange
Let me know what you think!