Firestick remote control of audio

CSODeepblue

New Member
I have set up our old iMac (late 2015) to watch TV via a Firestick (so we can use the remote control for convenience). The Firestick is working using a HDMI Video interface and I downloaded OBS software. The remote works OK for selecting channels etc. but won't control the volume (which has to be done by the keyboard or on screen) I've done all the basic checks to no avail. Can anybody point me in the right direction; or confirm if it just isn't possible? Thanks in advance
 
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