hi,
thanks for replies.

Some progress in that I have used Vlan to convert the file I have downloaded from you-tube. First attempt I had it convert to a WAV file

However, I now have 'driver cannot do requested conversion' displayed by BIB

I tried for a conversion to mp3. There is a toolbox addition in Vlan to allow you to set further parameters. I choose mpeg1.
ACW couldn't see this file, (*) didn't help and there is no 'all files' in filter box option.