flysky nv14 nirvana - how to assign volume to a switch ,opentx

Firmware used: https://www.rcgroups.com/forums/showpost.php?p=40927339&postcount=30&fbclid=IwAR3gQh-J5WzSpR2e_dN2mNgc47DXQgwjFHIUzPmra2zC-aKbXQq4QzoDL_s
Thanx to Genivos @Rcgroups .
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