How to Remove a Sound Output Device Created by an Application
Posting here for  reference if you still have the problem and for other searching the answer was found at the Apple Community Site 

Remove the following files:


/Library/Audio/Plug-Ins/HAL/Audiojingle.driver
/Library/LaunchDaemons/com.audiojinglex.soundtree.agent.plist
/Library/LaunchAgents/com.audiojinglex.soundtree.agent.plist


Then restart coreaudiod using terminal sudo /bin/launchctl kill SIGTERM system/com.apple.audio.coreaudiod || /usr/bin/killall coreaudiod

or use the following script it does the same thing (I personally did it manually)

#!/bin/bash

# remove driver
DRIVER_NAME="Audiojingle.driver"
DRIVER_INSTALL_PATH="/Library/Audio/Plug-Ins/HAL/${DRIVER_NAME}"
if [  -d "${DRIVER_INSTALL_PATH}" ]; then
    /bin/rm -rf "${DRIVER_INSTALL_PATH}" || exit 1
fi

# remove helper plist

LAUNCHD_PLIST_INSTALL_PATH="/Library/LaunchDaemons"
LAUNCHD_PLIST_INSTALL_PATH_BACKUP="/Library/LaunchAgents"
LAUNCHD_PLIST_FILENAME="com.audiojinglex.soundtree.agent.plist"
LAUNCHD_PLIST="${LAUNCHD_PLIST_INSTALL_PATH}/${LAUNCHD_PLIST_FILENAME}"
LAUNCHD_PLIST_BACKUP="${LAUNCHD_PLIST_INSTALL_PATH_BACKUP}/${LAUNCHD_PLIST_FILENAME}"

# romove the plist.
if [ -e "${LAUNCHD_PLIST}" ]; then
    /bin/rm -f "${LAUNCHD_PLIST}"
fi

if [ -e "${LAUNCHD_PLIST_BACKUP}" ]; then
    /bin/rm -f "${LAUNCHD_PLIST_BACKUP}"
fi

#/usr/bin/killall -u "_coreaudiod" "coreaudiod"
/bin/launchctl kill SIGTERM system/com.apple.audio.coreaudiod || /usr/bin/killall coreaudiod

echo "restart coreaudio"

sleep 2