Pi4 and HiFiBerry DAC2 Pro

OK I seem to have got it working. I saw something on the HiFiBerry forum relating to the config.txt file

https://support.hifiberry.com/hc/en-us/community/posts/360014289277-Hifiberry-DAC2-PRO-last-version-Volumio-NO-SOUND

I added the following lines to my boot\userconfig.txt file and it works now
force_eeprom_read=0
dtoverlay=hifiberry-dacplus