Problem with mod-morph and volume media keys

[Ciebiada]

Hi Guys!

I want to bind LALT + G to C_VOL_UP

I have this, which works with everything else, but not in this case

behaviors {
        vol_up: volume_up {
                compatible = "zmk,behavior-mod-morph";
                #binding-cells = <0>;
                bindings = <&kp G>, <&kp C_VOL_UP>;
                mods = <(MOD_LALT)>;
        }
}

Instead of increasing volume my Mac opens volume settings 🤯. When I bind C_VOL_UP to a key on a layer it works just fine.

Am I missing something?

[caksoylar]

Do you have Karabiner Elements installed?

[Ciebiada]

I've had it installed in the past, but uninstalled some time ago. Do you think it could have a permanent effect, even after it is uninstalled and not running?
Also I have a bunch of other mod-morphs defined e.g. LGUI + f -> right arrow. Which works fine, sending just right arrow.

[caksoylar]

It shouldn't, no. What key combination is supposed to open the volume settings? (I don't own a Mac.)

[Ciebiada]

Apparently it’s option + volume. Which makes sense. So it looks like the code I posted is still sending LALT mod for some reason

[caksoylar]

This might be similar issue: #1685 (comment)

I suspect the mod masking of mod-morphs don't work with keycodes from the consumer usage page like C_VOL_UP.