a)
//echo -s $asctime($calc($timezone + $sound($sfile(*.mp3,MP3)).length / 1000),H:nn:ss)
does not work (any mp3 file not work with it):
* /echo: insufficient parameters
b)
alias mp3dur tokenize 46 $calc($1 /1000) | return $gmt($1,$iif($1 > 3599,H:) $+ nn:ss)
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//echo -a $mp3dur($sound($findfile(D:\Energy\Currents\,*.mp3,1)).length)
//echo -a $mp3dur($insong.length)
--> Not working, too!

(
Here I can see the wrong file length again.
Mathias