[arm-allstar] Telemetry volume

[David McGough]

Remember that the RX level setting (option 2 in simpleusb-tune-menu) is
the most important, since this is the level sent across the network and
back out to the local TX.  When running option 2, there is a real-time
graphic showing the audio level, with the 3KHz point on this graphic being
the target level to aim for, keeping peaks below 5KHz (and cerainly NOT
off the end of the scale!).

Once the RX level is correct, then adjust the TX settings, which are only
heard via the local transmitter.  There should be no distortion on any
telemetry with the default telemetry levels.


73, David KB4FXC