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Zen AIO A5400 HDMI IN - how to control volume?

Star I
Hi All
I have a cable box going into my Zen AIO A5400 HDMI IN. I can see the picture and hear the audio through the internal speakers no issues. However, I want to be able to control the volume (i.e. mute). I have not been able to find a solution.
I plugged a speaker into the headphone jack and I also get audio but it does not stop the audio from the speakers. Is there a way to disable the internal speakers? I suspect that because I am going into the HDMI port directly instead of going into Windows would mean I may need to change it in BIOS?
Any help appreciated