diff --git a/overlay/etc/udev/rules.d/90-et-digirig-mobile.rules b/overlay/etc/udev/rules.d/90-et-digirig-mobile.rules
index 74a26ca..f36780e 100644
--- a/overlay/etc/udev/rules.d/90-et-digirig-mobile.rules
+++ b/overlay/etc/udev/rules.d/90-et-digirig-mobile.rules
@@ -1,6 +1,6 @@
 # Author   : Gaston Gonzalez
 # Date     : 30 September 2024
-# Updated  : 23 October 2024
+# Updated  : 21 November 2024
 # Purpose  : udev rules for the DigiRig Mobile v1.9 
 #
 # Preconditions:
@@ -18,9 +18,18 @@ SUBSYSTEM=="tty", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea60", ENV{ET_DEVI
     ENV{ET_DEVICE}="DIGIRIG_MOBILE", ENV{ET_SUBDEVICE}="CAT", GROUP="dialout", MODE="0660", SYMLINK+="et-cat", \
     RUN+="/usr/bin/systemctl start rigctld"
 
+# The audio chipset changed for DigiRig v1.9. This rule handles the original revision.
+# Audio device will only match if PROGRAM above matches (exit status=0)
+SUBSYSTEM=="sound", ATTRS{idVendor}=="0d8c", ATTRS{idProduct}=="0012", \
+    PROGRAM="/opt/emcomm-tools/sbin/udev-tester.sh digirig-mobile", \
+    ACTION=="add", \
+    ENV{ET_DEVICE}="DIGIRIG_MOBILE", \
+    ATTR{id}="ET_AUDIO", \
+    ENV{ET_SUBDEVICE}="AUDIO", GROUP="audio", MODE="0660", SYMLINK+="et-audio"
+
+
 SUBSYSTEM=="sound", ATTRS{idVendor}=="0d8c", ATTRS{idProduct}=="013c", ENV{ET_DEVICE}=="", \
     ACTION=="add", \
     ATTR{id}="ET_AUDIO", \
     ENV{ET_DEVICE}="DIGIRIG_MOBILE", ENV{ET_SUBDEVICE}="AUDIO", GROUP="audio", MODE="0660", SYMLINK+="et-audio"
 
-# TODO: Add rules for earlier 1.9 release
diff --git a/overlay/opt/emcomm-tools/sbin/udev-tester.sh b/overlay/opt/emcomm-tools/sbin/udev-tester.sh
index 781c92a..878ee0e 100755
--- a/overlay/opt/emcomm-tools/sbin/udev-tester.sh
+++ b/overlay/opt/emcomm-tools/sbin/udev-tester.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 # Author  : Gaston Gonzalez
 # Date    : 11 October 2024
+# Updated : 21 November 2024
 # Purpose : Perform tests that can be used by the udev subsystem to aid
 #           in rule development. This is intended to by used with the PROGRAM
 #           directive inside of a udev rule.
@@ -26,6 +27,37 @@ test_yaesu_ft891() {
   exit 1
 }
 
+# Exit with a 0 exit success if, and only if, the currently selected radio 
+# uses a DigiRig Mobile.
+test_digirig_mobile() {
+  if [ -L "${ET_HOME}/conf/radios.d/active-radio.json" ]; then
+    ID=$(cat "${ET_HOME}/conf/radios.d/active-radio.json" | jq -r .id)
+
+    if [[ "$ID" == "digirig-mobile-no-cat" ]]; then
+      et-log "Old DigiRig Mobile detected for no CAT device"
+      exit 0
+    fi
+
+    if [[ "$ID" == "yaesu-ft818nd" ]]; then
+      et-log "Old DigiRig Mobile detected for FT-818ND"
+      exit 0
+    fi
+
+    if [[ "$ID" == "yaesu-ft857d" ]]; then
+      et-log "Old DigiRig Mobile detected for FT-857D"
+      exit 0
+    fi
+
+    if [[ "$ID" == "yaesu-ft897d" ]]; then
+      et-log "Old DigiRig Mobile detected for FT-897D"
+      exit 0
+    fi
+
+  fi
+  
+  exit 1
+}
+
 usage() {
   echo "usage: $(basename $0) <radio ID>"
 }
@@ -39,6 +71,8 @@ case $1 in
   yaesu-ft891)
     test_yaesu_ft891
   ;;
+  digirig-mobile)
+    test_digirig_mobile
 esac
 
 exit 1