Differences between using sndioctl on OpenBSD and Linux

I am required to use Linux and so I have transferred my typical OpenBSD 
setup to it but noticed the keybind I use to mute and unmute does not 
function. Increasing and decreasing the volume work fine but sndioctl 
output.mute=! returns output.mute: no such control. Is this a limitation 
of sndio using ALSA or could it be added?

Jesper