[arm-allstar] FT7900 Node

[Chris Souleles]

I've just installed a Yaesu FT-7900 in a node with an RPI3 and DMK URi running latest version of HAMVOIP. I have it basically working and I'm trying to optimize the audio.  I have a couple questions.   (node connections and simple usb at bottom of this email)  
The Tx A level has to be set down to 20 for things to work.  Any higher and I start to get audio distortion and some audio cut out.  Is there something I should change in the interface to get this closer to the default value or is running at 20 ok as long as it works?  I'm running the FT-7900 in the low power mode.  (I'm not exactly sure what Tx A Level setting does)
I have to run pre-emphasis on and de-emphasis off for it to work.  If I turn de-emphasis on then some of the DTMF tones don't work (mostly 3 and 6).  If I turn pre-emphasis off then I get some audio cut out,  Is it normal to have one on and the other off?
When I look at Rx Voice Level it hits the 5 KHZ on peaks when I talk sideways to the mic.
I'm interfacing to the data port on the FT-7900 as follows.  Straight wires, no resistors.FT7900 PTT pin 3             - URi pin 1
FT7900 COS pin 6            - URi pin 8FT7900 Audio in pin 1       - URi pin 22FT79009 Audio out pin 5   - URi pin 21FT7900 GND  pin 2           - URI pin 20FT7900 shield                    - URI pin 20
Simple USBCard is                        0Name is                    USBRx Level                    550Rx no delay                0Rx  audio delay          10Tx A level                    20Tx B level                    0Pre-emphasis            yesDe-emphasis              noPL filter                       yesRx boost                     yesPTT active            activelowPTT status            unkeyedCTCSS                 ignoredCOS                     CM108/CM119 active highCOS test              unkeyedCOS composite   unkeyed