[tlug] Adding a modifier to a keysym with xmodmap

[<stephen@example.com>]

Josh Glover writes:

 > What I would really like to do is make the XF86AudioRaiseVolume keysym
 > generate a "Control + Tab", so that I can use it for, say, switching
 > tabs in Firefox.

I don't think you can do this with xmodmap.  Modifier keys are
different from regular keys in basic X, for efficiency in on-the-wire
representation of chords.  It may be possible to do it with the XKBD
extension.