there is ASR preset for this. you can use any ASR preset as virtual tag function.I can't find ASR presets :/
$If($Div($Split(<Album Duration>,:,1),60)<1,<Album Duration>,$RoundDown($Div($Split(<Album Duration>,:,1),60),0):$Pad($Mod($Split(<Album Duration>,:,1),60),2):$Split(<Album Duration>,:,2))
its "Convert 'mmm:ss' or 'mmm.ss' in '<Tag 1>' to 'hh:mm:ss' in '<Tag 2>'" preset. to make it to work as virtual tag function select it, then enter some word in "assign virtual tag function id" field, click 'save all' button and restart mb.
use function $ASR(<URL>,your_id) in virtual tag.
its "Convert 'mmm:ss' or 'mmm.ss' in '<Tag 1>' to 'hh:mm:ss' in '<Tag 2>'" preset. to make it to work as virtual tag function select it, then enter some word in "assign virtual tag function id" field, click 'save all' button and restart mb.Hi!
use function $ASR(<URL>,your_id) in virtual tag.
No such tag in menu, and afaik <Album Duration> isn't tag, it is an MB embedded function
I tried your suggestion: SYNTAX ERROR.