Tag formatting - cannot get to work

[Karen]

hmmm - I am interested in this last comment "you can use #Audio tags as values in indexFormat". I would love to set up an Index that combined the two fields #audioformat and #audiodata but am struggling to get a syntax that works.

I have indexTags including .., #AudioData:Audio Data, #AudioFormat:Format,

And then tried tagFormat of #AudioFormat.indexFormat={$#audioformat$#audiodata}

But no joy. Should this be possible?
thanks again, sorry for hassle,
Karen.