Here is a 6" audio extension cable that one of our customers recommended. We've had a few more customers tried it and confirmed it works well on their iPads. Hope it'll work for you too!
http://www.cablesonline.com/35mmsttmatfe.html
Specifications
- Connectors
- (1) 3.5 millimeter Stereo (TRRS) Male
- (1) 3.5 millimeter Stereo (TRRS) Female
- Gold plated
- Length: 6 inches (0.5 foot)