Hawaiian Beta Sound Problem
There is no sound in the Hawaiian Beta. You don't hear anything when working a lesson.
Please keep in mind that it only had a couple months in the Incubator, it's in Beta, and is still relatively new (October 8~14th-ish). Navajo also has no audio, and was in the Incubator for a shorter amount of time.
All we can do is wait for the audio to be added. We waited for Swahili; we can wait for Hawaiian.