Tag Update and audio quality

[SoundAdikt]

Hello, first thanks for the automatic selection capability for indextags, this means I know longer have to use tag update to replace "1" with "Press here".
Concerning tag update, I've been trying to replace the standard audio quality categories with alternatives, for example HD with Studio Master. My tagupdate file looks as follows:

@AUDIOQUALITY=HD
=AUDIOQUALITY=Studio Master

I'm wondering if I'm doing something wrong or whether this is not currently possible.

Many thanks, SoundAdikt.