[arm-allstar] Icom UR8050 connection

[Matt]

Hi all.

I'm trying to get an Allstar node connected up to an Icom UR8050 
repeater. I'm using the RPi3 image which is working well and a modified 
USB sound fob.

The Icom has a "Busy" output which becomes high when the repeater is 
receiving so I guess this need to connect to the COS line on the USB 
fob. My question is, what setting should I use in simpleusb.conf?

I think I should be using carrierfrom=usb. Can anyone confirm that?

Thanks.

Matt
M0LMK