How is the WA306 cable different than the WA302 cable?
The WA306 has a gold-plated Neutrik 1/4" phone plug connector. The WA306 cable has lower handling noise and is more durable. The WA306 TQG connector is better quality; it has a push-button lock.
The WA306 does not replace the WA302. Both cables are still offered as of October 2013.