xhbl from kodi.tv forum just updated the dual audio builds to krypton 
[Project] Dual Audio Output support (Krypton/Jarvis/Isengard/Helix/Gotham/Frodo)
Posts by epicfail
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There you go....anyway it would be a nice feature if it could be in the official releases
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DarkAngel2401 from kodi.tv did the job. Not tested by me...