Multichannel AAC Audio on the U22 running CoreELEC


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Can anyone confirm whether AAC multichannel audio will work correctly using CoreELEC on the U22

I have followed this guide >>

and all works well except for playback of multichannel AAC

I have my U22 connected via HDMI to a DD Atmos/HD audio capable AVR ( Sony STR-DH790)
In Kodi settings have selected pasthrough using the HDMI device option.

All other audio seems to work fine, ie AC3, DD Atmos, True HD , DTS-X etc
Only multichannel AAC fails, symptons are slurred, slow speed sounding audio with droputs.