I always recommend that users start out with the simpleUSB radio interface as it proves out hardware without the complexity of SW adjustments. If you have a radio that will work this way, if it has de/pre-empashized audio and COS, PTT such as one you previously used with IRLP then it is easy to use simpleUSB. I use Alinco's with the data connector. Five wires to the DMK, audio in/out, PTT, COS, ground.
The Acid Allstar installation disk comes with USBradio as stock, the simpleUSB file is not even in the asterisk directory. It is on the installation disk in the -
/usr/src/astsrc/configs/simpleusb/ directory and needs to be copied to the asterisk directory. 
SimpleUSB installation instructions are at
http://ohnosec.org/drupal/node/193
I use simpleusb on my systems and I have set it up on others and it works well. If the hardware takes care of these things why have the SW do it. Yes it is more flexible and more techy vogue to use USBradio but it works fine without it and it is a lot less load on the prcosessor especially on systems where you have multiple nodes and marginal processing power.
So if things are just not working maybe try simpleUSB. You can always go back to  USBradio later.
73 Doug
WA3DSP
http://www.crompton.com/hamradio
From: ea8ee1 at gmail.com
Date: Sat, 8 Feb 2014 23:45:22 +0000
To: jrorke at cogeco.ca
CC: app_rpt-users at ohnosec.org
Subject: Re: [App_rpt-users] audio radio to internet issue
sorry the same problem not  audio from radio to internet yet 
2014-02-08 23:12 GMT+00:00 REDBUTTON_CTRL <jrorke at cogeco.ca>:
  
    
  
  
    OK  If you are using packet port (discriminator) then set ctcssfrom=
    no
    and carrierfrom=dsp
    and 
    rxdemod=flat
    
    That should get IT working.
    
    Jon
    
    On 2/8/2014 6:11 PM, ea8ee wrote:
    
      
        
          
            
              I use FT8900 with rear packet minidim with URI DMK 
              
              so I will change
            
            ctssfrom=no/usb 
          
          carrierfrom=usb or usbinvert/dsp( I think the yaesu use cor
          low but anyway the uri work nice with ptt and audio from
          internet the problem is only the audio from my rig to internet
          is deaf)
        
        rxdemod=flat/no
        
        
      
      
        
        2014-02-08 22:43 GMT+00:00
          REDBUTTON_CTRL <jrorke at cogeco.ca>:
          
             Oh and set
              ctcssfrom=no
              That way it wont be looking for a tone decoder output to
              let audio in.
              Jon RQ
              
                
                  
                  On 2/8/2014 5:39 PM, REDBUTTON_CTRL wrote:
                   If this is your usb
                    radio.conf file then it is missing a couple of
                    things.
                    
                    You need the following:
                    
                    carrierfrom=usb (or usbinvert if your cor is active
                    low)
                    
                    and the rxdemod must be set to speaker or flat
                    
                    That should get tit listening to rx audio to start.
                    
                    Jon VA3RQ
                    
                    On 2/8/2014 5:31 PM, ea8ee wrote:
                    
                      
                        
                          
                            
                              
                                
                                  
                                    
                                      
                                        
                                          
                                            
                                              
                                                
                                                  
                                                    
                                                      
                                                        
                                                          usb27305
                                                          
                                                          rxboost=1
                                                        
                                                        txboost=1
                                                      
                                                      rxctcssrelax=1
                                                    
                                                    txctcssdefault=88.5
                                                  
                                                  rxctcssfreqs=88.5
                                                
                                                ;rxctcssoverride=0
                                              
                                              ctcssfrom=usb
                                            
                                            rxdemod=no
                                          
                                          txprelim=no
                                        
                                        txlimonly=no
                                      
                                      txtoctype=notone
                                    
                                    txmixa=composite
                                  
                                  txmixb=composite 
                                
                                invertptt=0
                              
                              duplex=0
                            
                            rxondelay=o
                          
                          rxnoisefiltype=0
                        
                        eeprom=1
                        
                        The DMK works nice in TX but in RX not receive
                        nothing
                        
                          
                            
                              
                                
                                  
                                    
                                      
                                        
                                        
                                      
                                    
                                  
                                
                              
                            
                          
                        
                      
                      
                        
                        2014-02-08 20:02
                          GMT+00:00 Doug Crompton <doug at crompton.com>:
                          
                            
                              I think
                                  it found your adapter as you said you
                                  had audio in one direction. If not see
                                  below.
                                  
                                  Did you select the active usb device
                                  in the config utility before you tried
                                  to make changes?
                                  
                                  
                                  If the adapter is not being found at
                                  all try this....
                                  
                                  The following USB interfaces are
                                  defined in usbradio -
                                  
                                  #define C108_VENDOR_ID          0x0d8c
                                  #define C108_PRODUCT_ID         0x000c
                                  #define C108AH_PRODUCT_ID       0x013c
                                  #define C119_PRODUCT_ID         0x0008
                                  #define C119A_PRODUCT_ID        0x013a
                                  #define N1KDO_PRODUCT_ID        0x6a00
                                  #define C108_HID_INTERFACE      3
                                  
                                  When you boot up you should see one of
                                  these initialized in the messages.
                                  After boot do -
                                  
                                  dmesg | more
                                  
                                  and page through and see if it found
                                  your adapter.
                                  
                                  I am using the DMK and it looks like
                                  this -
                                  
                                  [root at WA3DSP_Allstar wa3dsp]# dmesg |
                                  grep Sound
                                  input: C-Media Electronics Inc.      
                                  USB PnP Sound Device as
                                  /class/input/input0
                                  input,hidraw0: USB HID v1.00 Device
                                  [C-Media Electronics Inc.       USB
                                  PnP Sound Device] on
                                  usb-0000:00:1d.0-1
                                  
                                
                                73 Doug
                                    WA3DSP
                                    http://www.crompton.com/hamradio
                                  
                                  
                                
                                
                                  From: ea8ee1 at gmail.com
                                  Date: Sat, 8 Feb 2014 19:14:56 +0000
                                  To: app_rpt-users at ohnosec.org
                                  Subject: Re: [App_rpt-users] audio
                                  radio to internet issue
                                  
                                    
                                      
                                      I tried with  cli
                                        and radio tune rxnoise and the
                                        pc says the device usb27305
                                        currectly not active ! any
                                        suggestion?
                                        
                                          
                                          2014-02-08 8:51 GMT+00:00
                                            jose <ea8ee1 at gmail.com>:
                                            
                                              
                                                Hi Doug! the ptt
                                                  and audio from
                                                  internet to radio
                                                  works nicely the
                                                  problem is about the
                                                  audio from radio to
                                                  internet not audio
                                                  neither the node
                                                  receive the dmtf from
                                                  radio or
                                                  webstransceiver
                                                  
                                                  El 08/02/2014 6:31,
                                                  Doug Crompton
                                                  escribió:
                                                
                                                
                                                  You
                                                      need to set - 
                                                      
                                                      duplex=1  ;
                                                      Simplex, no
                                                      telelmetry
                                                      duplex=0  ;
                                                      Simplex,
                                                      telelmetry
                                                      
                                                      in rpt.conf if you
                                                      are running
                                                      simplex. 
                                                      
                                                      Also make sure the
                                                      polarity is
                                                      correct in your
                                                      usbradio or
                                                      simpleusb file for
                                                      the PTT and COS if
                                                      you are using it.
                                                    
                                                  
                                                
                                              
                                            
                                          
                                          
                                        
                                      
                                      
                                    
                                  
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