No sound E6, 11" iPad pro through HDMI

I'm running E6 on an iPad pro using a HDMI dongle.  Picture is great! Sound cuts out as soon as the dongle is inserted.

This is a known issue with iPads and HDMI dongles (or so it seems from my searching) Has anybody found a workaround? All the apple based forums recommend running sound through Bluetooth, but I'd rather leave that connection discreet to the R10.

Do I nee an apple tv if I want to use my projector with sound?