How to adjust the volume in float value by autohotkey

Question

Those are all function I want to do.

    Pause::Send {Volume_Mute}
    Insert::Send {Volume_Down 1}
    ScrollLock::Send {Volume_Up 1}

Press those keys to do volume controls.
Those codes seems to work, BUT I have little problem with it.
I only want it to increase/decrease 1% of volume every press.
But actually it changes 2%, it is to much to me
And it doesn't seems to work like follow codes as my expect

    Insert::Send {Volume_Down 0.5}

Have some expert know how to fix it? thank you guy.

Answer 1

I basically already answered this question on Super User. It is based on a library called Vista Audio Control Functions.
Check it out here.