Heheh... "moving air"...
What you're hearing is "white noise", common to many pedals. Some pedals are worse than others in terms of white noise, and as you play with more pedals, you'll come to notice that. An experienced repair person can probably modify it, but it's always tricky to get rid of most white noise without changing the sound of the pedal.
If you can't get the wah sound you're looking for out of a Dr. Q, try the Mini Q-Tron or Micro Q-Tron instead - they'll probably be more up your alley, and they sound great. It's usually not worth modding most pedals, IMO - you're better off trying another of the hundreds of autowah and envelope filter pedals out there
The Dr. Q isn't too popular among bassists, for one reason or another. I have yet to try one myself, but I'm not really motivated to try it.