Hello,

Let's start from what I know:
* assign a character to key or combo:
F5 (key) -> ę (char)
alt+F5 (combo) -> × (char)

* assign key to key (mapping)
F13 (key) -> XF86VolumeUp (key)

But this I don't know and here is the question:

? how to assign key to a combo
ctrl+F13 (combo) -> XF86VolumeDown (key)

? how to assign combo to a key
F13 (key) -> ctrl+shift+A (combo keys, A is a key here, not character)

All bindings above were just examples of course.

If possible I am interested in using xkb, if not -- xmodmap. Thank you in advance for hints/links/help.

Cheers,