How to change volume increment to 4 and persist through updates

[PopCat19]

In KDE Plasma, there's an option to change volume increments. How can I configure volume increments and keep the config without it being overwritten every ./install.sh -r?

[kRHYME7]

edit the increments in keybindings.conf

[PopCat19]

edit the increments in keybindings.conf

What do I need to edit here; was there an arg to change increments? (e.g. 4)

# Audio control
bindl  = , F10, exec, $scrPath/volumecontrol.sh -o m # toggle audio mute
bindel = , F11, exec, $scrPath/volumecontrol.sh -o d # decrease volume
bindel = , F12, exec, $scrPath/volumecontrol.sh -o i # increase volume
bindl  = , XF86AudioMute, exec, $scrPath/volumecontrol.sh -o m # toggle audio mute
bindl  = , XF86AudioMicMute, exec, $scrPath/volumecontrol.sh -i m # toggle microphone mute
bindel = , XF86AudioLowerVolume, exec, $scrPath/volumecontrol.sh -o d # decrease volume
bindel = , XF86AudioRaiseVolume, exec, $scrPath/volumecontrol.sh -o i # increase volume

[kRHYME7]

volumecontrol.sh -0 i 4 
volumecontrol.sh -o d 4