[arm-allstar] Tx A Level Setting

[Chris Souleles]

What is the best way to determine correct setting for Tx A Level?  Now that I have added a voltage divider on the audio line between the FT7900 and the DMK URi it has put it within the SW adjustment range, but I don't know how to determine the best setting.  
The Rx side is working well with Rx Level at 500, pre-emphasis on, Rx boost on and voice peaks just at 5Khz.
The node is FT7900, DMK URi, RPI3.  
Thanks,  Chris - W6CS - 73