barra progresso audio html5

[fankisib]

ho risolto così

$("#myTime").change(function(){                 
var tim = document.getElementById("myTime").value;            
var track_length = $(".audiocontrol")[counter].duration;                
var ct = (tim / 100) * track_length;              
$(".audiocontrol")[counter].currentTime = ct ;
$("#message").text(ct);
})