[arm-allstar] simultaneous asterisk and direwolf possible?

[Tony]

My hamvoip node is often connected to an ASL hub node on a large network 
of linked repeaters. Occasionally, we all hear what sound like APRS 
beacons, as they occur regularly every 10 or 15 minutes. The idea occurs 
to me to use "direwolf" to decode these beacons, so that the responsible 
operator can be alerted to their error of beaconing on a linked network 
of FM repeaters.

The initial problem occurs as an inability to share the USB sound card 
audio:

[root at yellow ~]# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Device [USB Audio Device], device 0: USB Audio [USB Audio]
   Subdevices: 0/1
   Subdevice #0: subdevice #0

[root at yellow ~]# grep -E "^ADEVICE|^ACHANNELS" direwolf.conf
ADEVICE plughw:0,0 -
ACHANNELS 1

[root at yellow ~]# direwolf -t 0
Dire Wolf version 1.5
...
Reading config file direwolf.conf
Audio device for both receive and transmit: plughw:0,0  (channel 0)
Could not open audio device plughw:0,0 for input
Device or resource busy
Pointless to continue without audio device.

This occurs even if /run/lock/asound.state.lock and its symlink 
/var/lock/asound.state.lock are rm'd. It runs properly if asterisk isn't 
running, but then the ASL audio stream containing the APRS isn't available:

[root at yellow ~]# astdn.sh && direwolf -t 0
Stopping Asterisk...
Asterisk ended with exit status 0
Asterisk shutdown normally.
Dire Wolf version 1.5
...
Reading config file direwolf.conf
Audio device for both receive and transmit: plughw:0,0  (channel 0)
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, E+, 44100 sample rate / 3, 
DTMF decoder enabled.
Ready to accept AGW client application 0 on port 8000 ...
Ready to accept KISS TCP client application 0 on port 8001 ...

Is there some way to get both asterisk and direwolf listening to the 
same audio stream? Or must I use a USB RTL-SDR stream listening on the 
simplex node radio frequency and decode the APRS from among that audio 
stream?