I used this in my system config to map different keycodes to the same keysym event:

```
xmodmap -e 'keycode 164 = XF86AudioPlay'
xmodmap -e 'keycode 152 = XF86AudioPlay'
```

xbindkeys config:
```
(xbindkey "XF86AudioPlay" "playerctl play-pause")
```

This does not get triggered when pressing the key with keycode 164, but xbindkeys -k prints the key symbol.

I think the problem is that XKeysymToKeycode in `grab_keys()` and in `event_loop()` only will return one of the keycodes that map to the keysym.