I've just been told unofficially that this is a 'legacy' issue. i.e. to ensure that as many types of device as possible can play them, even ancient kit. Jim -- Electronics https://www.st-andrews.ac.uk/~www_pa/Scots_Guide/intro/electron.htm Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html Audio Misc http://www.audiomisc.co.uk/index.html