Sound option slider

Is there any documentation on how to do volume sliders? When I search the forum I only find dead links to old posts.

Yeah I found the first one, but the link to te project file is broken. But I see in your second link the link to AFRLme's dropbox. With a volume slider folder:

it's an out of date method, but it should still work ok. I believe the script was actually written by Einzelkaempfer. I use a new script & method for option/volume sliders these days, but unfortunately I've not gotten around to sharing said method.