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It'd be easier to cheat. Build an app to monitor the system volume... when it goes up, advance to the next slide, when it goes down, go back a slide. Probably would then have to reset the volume to, say, 50% after each slide change, thereby reseting everything for the next one. When utility starts have it set the volume to 50% and mute, when it exits have it put the volume back to the way it was before the utility ran.
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