Jazz-Soft.net
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MidiInClose () - close the active MIDI In connection.
Returns nothing.
Unlike the default (software) MIDI Out connection that one can open multiple times on different pages, you will have to share a single MIDI In device between all your pages.
A possible solution is to close MIDI In connection when the page loses focus, and reopen it when the page becomes active.
// NOTE: This code may work incorrectly in some ancient browsers.
if(navigator.appName=='Microsoft Internet Explorer'){
document.onfocusin=function(){ Jazz.MidiInOpen(0,function(t,a,b,c){ Jazz.MidiOut(a,b,c);});};
document.onfocusout=function(){ Jazz.MidiInClose();};
} else {
window.onfocus=function(){ Jazz.MidiInOpen(0,function(t,a,b,c){ Jazz.MidiOut(a,b,c);});};
window.onblur=function(){ Jazz.MidiInClose();};
}