not sure I'm missing something but I see read as the method for fetching audioProperties (and the most indicated one given the amount of data to parse), however I missed something like this but sync.
does tagSync support extracting audioProperties?
Currently there is no support for sync audioproperties extraction, since there was no demand for it.
If you really need it, feel free to add it and send a pull request. A lot of code can be lifted straight from the async version.
Otherwise I'll add it myself in a few days.