first you need to make sure you are loading the usbradio channel drivers in modules.conf :
set 
noload => chan_simpleusb.so
load => chan_usbradio.so

in rpt.conf set:

rxchannel = radio/usb_NODENUMBER   <==  replace with you actual node number
comment out any other rxchannel lines place a (  ;  ) semi-colon at the beginning of the line.
run from cli  radio-tune-menu
put radio in monitor mode (press and hold mon button) to auto detect RX noise level
USE A SERVICE MONITOR to set RX voice level and RX CTCSS level

USE a SERVICE MONITOR to set TX levels

without the use of a service monitor you can not guarantee quality levels or levels within limits of what equipment was designed for. 
or proper decoding of DTMF tones 
finish with the rest of the settings then make sure you use option W to write the config file


On Sun, Feb 4, 2018 at 11:09 PM, Neil k8it <k8it@cac.net> wrote:
I am willing to work with you, to get it working.
please send me a direct email with your contact info and when you are available.
I am blind but have multiple allstar under my control.
uour first node is always a challenge.
having flat audio from the receiver is essential.

also in your email please answer what instructions have you used to wire up the 888 radio and modify the uri



Thanks
73 Neil Sablatzky  K8IT
Allstar Node 41838 KITLINK
Allstar Node 42087 KITLINK HUB
IRLP Node exp0068
Echolink K8IT-L
WIRES-X K8IT 11479 Room 21479

--------------------------------------------------
From: "David Waters" <dwaters5@yahoo.com>
Sent: Sunday, February 04, 2018 6:04 PM
To: <app_rpt-users@lists.allstarlink.org>
Subject: [App_rpt-users] 888 and usb

I have a modified 888 radio and run through a modified fob to my AllStar node. The problem is when sending a DTMF command the computer never receives it and displays a 6~. On screen. Tried everything under usb simple to get it to work but nothing works. Someone said to use us radio. Conf but I don’t know how to force the AllStar software to run that file. It picks us simple.conf instead. Any help would be appreciated. Keep in mind I know nothing about AllStar software I am just learning.

David Waters
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--

Nathan Hardman
N8THN@ARRL.NET