Monitoring XR18/ X32 while using tablet/phone

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How do you monitor with headphones when using a tablet or phone to control an XR18, X32 when in the need of soloing a channel? 


As it only transfers commands and not audio you have to plug your cans in the mixer or use wireless beltpacks... 


So I would like to know how do you approach this.


Thanks in advance to all comments and suggestions.