Ha ha, well before I jettison my beloved souris, I will first need to get the keybindings work.
According to showkey, the keycodes are 224 and 225 for the brightness up and down
113 is mute, 114 vol down, 115 vol up
so in the JWM keys XML I set the appropriate commands (lumeus -10%/+10%) and amixer-related commands for the volume
But the system simply does not obey
So either showkey is lying to me, or else JWM doesn't care what I tell it to do
The Arch documentation, normally very good, is a bit ropey on this one.
Sorry to have to ask for your help once again :D
I just can't see what's wrong with my code here:
<Key keycode="224">exec:lumeus -10%</Key>
<Key keycode="225">exec:lumeus +10%</Key>
<Key keycode="113">exec:amixer set Master toggle</Key>
<Key keycode="114">exec:amixer set Master 10%-</Key>
<Key keycode="115">exec:amixer set Master 10%+</Key>
[EDIT: Turned out that showkey straight ahead lied to my face. xev is the command that gave me the true keycodes. I really have no idea how an app can get keycodes wrong, but anyhow, if you wanna bind custom keys on JWM, you just use xev, press the key, note the keycode, and then use the format above]